diff --git a/.github/workflows/check_release_notes.yml b/.github/workflows/check_release_notes.yml
index 8ffc85d0950..359046abcde 100644
--- a/.github/workflows/check_release_notes.yml
+++ b/.github/workflows/check_release_notes.yml
@@ -1,6 +1,6 @@
 name: Check release notes
 on:
-  pull_request:
+  pull_request_target:
     types: [opened, synchronize, reopened, labeled, unlabeled]
     branches:
         - 'main'
@@ -133,19 +133,19 @@ jobs:
 
                     if [[ ${_pr_link_occurences} -eq 1 ]]; then
                         echo "                  Found pull request URL in $release_notes once"
-                        RELEASE_NOTES_FOUND+="> | \\\`$path\\\` | [$release_notes](${FSHARP_REPO_URL}/$release_notes) | |"
+                        RELEASE_NOTES_FOUND+="> | \\\`$path\\\` | [$release_notes](${FSHARP_REPO_URL}/tree/main/$release_notes) | |"
                         RELEASE_NOTES_FOUND+=$'\n'
                     elif [[ ${_pr_link_occurences} -eq 0 ]]; then
                         echo "                  Did not find pull request URL in $release_notes"
                         DESCRIPTION="**No current pull request URL (${PR_URL}) found, please consider adding it**"
-                        RELEASE_NOTES_FOUND+="> | \\\`$path\\\` | [$release_notes](${FSHARP_REPO_URL}/$release_notes) | ${DESCRIPTION} |"
+                        RELEASE_NOTES_FOUND+="> | \\\`$path\\\` | [$release_notes](${FSHARP_REPO_URL}/tree/main/$release_notes) | ${DESCRIPTION} |"
                         RELEASE_NOTES_FOUND+=$'\n'
                         PULL_REQUEST_FOUND=false
                     fi
                 else
                     echo "          Did not find $release_notes in modified files"
                     DESCRIPTION="**No release notes found or release notes format is not correct**"
-                    RELEASE_NOTES_NOT_FOUND+="| \\\`$path\\\` | [$release_notes](${FSHARP_REPO_URL}/$release_notes) | ${DESCRIPTION} |"
+                    RELEASE_NOTES_NOT_FOUND+="| \\\`$path\\\` | [$release_notes](${FSHARP_REPO_URL}/tree/main/$release_notes) | ${DESCRIPTION} |"
                     RELEASE_NOTES_NOT_FOUND+=$'\n'
                 fi
             else
@@ -161,24 +161,29 @@ jobs:
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
             RELEASE_NOTES_MESSAGE_DETAILS+=$"> [!CAUTION]"
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
-            RELEASE_NOTES_MESSAGE_DETAILS+=$"> **No release notes found for the following paths.**"
+            RELEASE_NOTES_MESSAGE_DETAILS+=$"> **No release notes found for the changed paths (see table below).**"
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
             RELEASE_NOTES_MESSAGE_DETAILS+=$">"
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
-            RELEASE_NOTES_MESSAGE_DETAILS+=$"> Please make sure to add an entry with short succint description of the change as well as link to this pull request."
+            RELEASE_NOTES_MESSAGE_DETAILS+=$"> Please make sure to add an entry with an informative description of the change as well as link to this pull request, issue and language suggestion if applicable. Release notes for this repository are based on [Keep A Changelog](https://keepachangelog.com/en/1.1.0/) format."
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
             RELEASE_NOTES_MESSAGE_DETAILS+=$">"
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
-            RELEASE_NOTES_MESSAGE_DETAILS+=$"> Examples: "
+            RELEASE_NOTES_MESSAGE_DETAILS+=$"> **The following format is recommended for this repository:**"
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
-            RELEASE_NOTES_MESSAGE_DETAILS+=$"> \\\`- Respect line limit in quick info popup - https://github.com/dotnet/fsharp/pull/16208\\\`"
+            RELEASE_NOTES_MESSAGE_DETAILS+=$">"
+            RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
+            RELEASE_NOTES_MESSAGE_DETAILS+=$">"
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
-            RELEASE_NOTES_MESSAGE_DETAILS+=$"> \\\`- More inlines for Result module - https://github.com/dotnet/fsharp/pull/16106\\\`"
+            RELEASE_NOTES_MESSAGE_DETAILS+=$"> \\\`* <Informative description>. ([PR #XXXXX](https://github.com/dotnet/fsharp/pull/XXXXX))\\\`"
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
-            RELEASE_NOTES_MESSAGE_DETAILS+=$"> \\\`- Miscellaneous fixes to parens analysis - https://github.com/dotnet/fsharp/pull/16262\\\`"
+            RELEASE_NOTES_MESSAGE_DETAILS+=$">"
+            RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
+            RELEASE_NOTES_MESSAGE_DETAILS+=$">"
+            RELEASE_NOTES_MESSAGE_DETAILS+=$"> See examples in the files, listed in the table below or in th full documentation at https://fsharp.github.io/fsharp-compiler-docs/release-notes/About.html."
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
-            RELEASE_NOTES_MESSAGE_DETAILS+=$'**If you believe that release notes are not necessary for this PR, please add "NO_RELEASE_NOTES" label to the pull request.**'
+            RELEASE_NOTES_MESSAGE_DETAILS+=$'**If you believe that release notes are not necessary for this PR, please add <kbd>NO_RELEASE_NOTES</kbd> label to the pull request.**'
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
             RELEASE_NOTES_MESSAGE_DETAILS+=$'\n'
             RELEASE_NOTES_MESSAGE_DETAILS+=$"**You can open this PR in browser to add release notes: [open in github.dev](https://github.dev/dotnet/fsharp/pull/${PR_NUMBER})**"
diff --git a/BenchmarkDotNet.Artifacts/results/TaskPerf.Benchmarks-report-github.md b/BenchmarkDotNet.Artifacts/results/TaskPerf.Benchmarks-report-github.md
deleted file mode 100644
index 6cce7d6b240..00000000000
--- a/BenchmarkDotNet.Artifacts/results/TaskPerf.Benchmarks-report-github.md
+++ /dev/null
@@ -1,67 +0,0 @@
-``` ini
-
-BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19042
-Intel Xeon CPU E5-1620 0 3.60GHz, 1 CPU, 8 logical and 4 physical cores
-.NET Core SDK=5.0.104
-  [Host]     : .NET Core 5.0.6 (CoreCLR 5.0.621.22011, CoreFX 5.0.621.22011), X64 RyuJIT DEBUG
-  DefaultJob : .NET Core 5.0.6 (CoreCLR 5.0.621.22011, CoreFX 5.0.621.22011), X64 RyuJIT
-
-
-```
-|                                      Method |             Categories |           Mean |         Error |        StdDev |         Median |  Ratio | RatioSD |      Gen 0 |   Gen 1 | Gen 2 |   Allocated |
-|-------------------------------------------- |----------------------- |---------------:|--------------:|--------------:|---------------:|-------:|--------:|-----------:|--------:|------:|------------:|
-|                   ManyWriteFile_CSharpTasks |          ManyWriteFile |     4,186.6 μs |      81.32 μs |     201.00 μs |     4,187.4 μs |   1.00 |    0.00 |    15.6250 |       - |     - |    117288 B |
-|                   ManyWriteFile_taskBuilder |          ManyWriteFile |     5,744.5 μs |     124.34 μs |     356.76 μs |     5,712.3 μs |   1.38 |    0.11 |    62.5000 |       - |     - |    444882 B |
-|                         ManyWriteFile_async |          ManyWriteFile |     6,108.8 μs |     121.27 μs |     271.23 μs |     6,132.1 μs |   1.46 |    0.10 |   132.8125 |       - |     - |    704991 B |
-|                          ManyWriteFile_task |          ManyWriteFile |     5,014.3 μs |     100.18 μs |     204.65 μs |     4,973.0 μs |   1.19 |    0.07 |    15.6250 |       - |     - |    116996 B |
-|                        ManyWriteFile_async2 |          ManyWriteFile |     5,358.4 μs |     106.05 μs |     211.79 μs |     5,374.1 μs |   1.27 |    0.07 |    15.6250 |       - |     - |    117140 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                   NonAsyncBinds_CSharpTasks |          NonAsyncBinds |    17,444.8 μs |     374.32 μs |   1,097.80 μs |    17,030.4 μs |   1.00 |    0.00 | 15125.0000 |       - |     - |  79200000 B |
-|                   NonAsyncBinds_taskBuilder |          NonAsyncBinds |    26,000.1 μs |     440.68 μs |     880.09 μs |    25,621.3 μs |   1.47 |    0.09 | 22187.5000 |       - |     - | 116000000 B |
-|                         NonAsyncBinds_async |          NonAsyncBinds | 1,303,920.2 μs |  63,453.67 μs | 177,930.90 μs | 1,269,891.9 μs |  74.52 |   10.59 | 52000.0000 |       - |     - | 276000000 B |
-|                        NonAsyncBinds_async2 |          NonAsyncBinds |    24,213.0 μs |     191.23 μs |     178.88 μs |    24,168.6 μs |   1.38 |    0.09 | 18812.5000 | 62.5000 |     - |  98400000 B |
-|                          NonAsyncBinds_task |          NonAsyncBinds |    16,693.5 μs |     302.84 μs |     759.75 μs |    16,586.1 μs |   0.95 |    0.07 | 15125.0000 |       - |     - |  79200000 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                      AsyncBinds_CSharpTasks |             AsyncBinds |     8,335.4 μs |     190.47 μs |     558.61 μs |     8,197.5 μs |   1.00 |    0.00 |    15.6250 |       - |     - |    112119 B |
-|                      AsyncBinds_taskBuilder |             AsyncBinds |    11,567.6 μs |     229.28 μs |     522.18 μs |    11,360.0 μs |   1.39 |    0.12 |   296.8750 |       - |     - |   1559252 B |
-|                            AsyncBinds_async |             AsyncBinds |   127,872.2 μs |   3,090.27 μs |   8,866.56 μs |   127,900.8 μs |  15.38 |    1.47 |  1333.3333 |       - |     - |   8312000 B |
-|                             AsyncBinds_task |             AsyncBinds |     9,897.9 μs |     314.55 μs |     927.46 μs |    10,058.4 μs |   1.19 |    0.15 |    31.2500 |       - |     - |    192096 B |
-|                           AsyncBinds_async2 |             AsyncBinds |     8,165.2 μs |     156.64 μs |     347.09 μs |     8,051.9 μs |   0.98 |    0.07 |    62.5000 |       - |     - |    352218 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                  SingleSyncTask_CSharpTasks |         SingleSyncTask |     8,668.5 μs |     170.65 μs |     233.59 μs |     8,595.4 μs |   1.00 |    0.00 |          - |       - |     - |           - |
-|                  SingleSyncTask_taskBuilder |         SingleSyncTask |    12,402.4 μs |     103.89 μs |      92.10 μs |    12,366.7 μs |   1.43 |    0.04 |  9171.8750 |       - |     - |  48000000 B |
-|                        SingleSyncTask_async |         SingleSyncTask | 3,659,569.1 μs | 109,062.88 μs | 298,557.86 μs | 3,576,228.4 μs | 409.11 |   38.68 | 91000.0000 |       - |     - | 475999216 B |
-|                         SingleSyncTask_task |         SingleSyncTask |    10,642.1 μs |      90.05 μs |      84.23 μs |    10,622.2 μs |   1.23 |    0.04 |          - |       - |     - |           - |
-|                       SingleSyncTask_async2 |         SingleSyncTask |    28,177.5 μs |     263.90 μs |     220.37 μs |    28,134.6 μs |   3.25 |    0.08 |  7625.0000 |       - |     - |  40000000 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                  SyncBuilderLoop_NormalCode |                   sync |    81,206.3 μs |   1,598.95 μs |   1,570.38 μs |    80,813.7 μs |   1.00 |    0.00 | 36714.2857 |       - |     - | 192176000 B |
-|                SyncBuilderLoop_WorkflowCode |                   sync |    81,811.3 μs |   1,610.38 μs |   3,140.93 μs |    80,621.9 μs |   1.02 |    0.05 | 36714.2857 |       - |     - | 192176000 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|               TinyVariableSizedList_Builtin |  TinyVariableSizedList |    57,762.3 μs |   1,721.40 μs |   4,827.00 μs |    56,313.5 μs |   1.00 |    0.00 | 20375.0000 |       - |     - | 106666656 B |
-|            TinyVariableSizedList_NewBuilder |  TinyVariableSizedList |    17,122.1 μs |     341.76 μs |     650.23 μs |    17,233.0 μs |   0.29 |    0.03 |  2031.2500 |       - |     - |  10666656 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                   VariableSizedList_Builtin |      VariableSizedList |   330,273.8 μs |   6,534.98 μs |  13,051.05 μs |   328,659.3 μs |   1.00 |    0.00 | 63000.0000 |       - |     - | 330666624 B |
-|                VariableSizedList_NewBuilder |      VariableSizedList |   167,451.6 μs |   2,840.89 μs |   2,217.98 μs |   167,326.7 μs |   0.51 |    0.02 | 44750.0000 |       - |     - | 234666934 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                       FixedSizeList_Builtin |         FixedSizedList |   100,128.5 μs |   1,968.29 μs |   3,885.21 μs |   100,084.8 μs |   1.00 |    0.00 | 61166.6667 |       - |     - | 320000000 B |
-|                    FixedSizeList_NewBuilder |         FixedSizedList |   229,639.0 μs |   4,589.37 μs |  11,846.63 μs |   227,278.1 μs |   2.30 |    0.13 | 61000.0000 |       - |     - | 320000000 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|              TinyVariableSizedArray_Builtin | TinyVariableSizedArray |   100,414.3 μs |   1,995.07 μs |   4,462.26 μs |   100,631.3 μs |   1.00 |    0.00 | 30000.0000 |       - |     - | 157333304 B |
-|           TinyVariableSizedArray_NewBuilder | TinyVariableSizedArray |    28,538.5 μs |     632.86 μs |   1,825.93 μs |    28,426.7 μs |   0.29 |    0.02 | 10687.5000 |       - |     - |  55999968 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                  VariableSizedArray_Builtin |     VariableSizedArray |   356,489.5 μs |   3,061.89 μs |   2,714.29 μs |   356,174.5 μs |   1.00 |    0.00 | 77000.0000 |       - |     - | 405333840 B |
-|               VariableSizedArray_NewBuilder |     VariableSizedArray |   161,909.3 μs |     861.02 μs |     672.23 μs |   161,860.8 μs |   0.45 |    0.00 | 59000.0000 |       - |     - | 309333476 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                      FixedSizeArray_Builtin |        FixedSizedArray |    32,944.8 μs |     777.85 μs |   2,293.52 μs |    32,391.8 μs |   1.00 |    0.00 | 19875.0000 |       - |     - | 104000000 B |
-|                   FixedSizeArray_NewBuilder |        FixedSizedArray |   219,352.6 μs |   4,288.40 μs |  10,837.34 μs |   217,830.4 μs |   6.65 |    0.60 | 82333.3333 |       - |     - | 432000000 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|                  MultiStepOption_OldBuilder |        MultiStepOption |    63,360.5 μs |   1,199.04 μs |   1,062.92 μs |    63,133.5 μs |   1.00 |    0.00 | 38750.0000 |       - |     - | 202666703 B |
-|                  MultiStepOption_NewBuilder |        MultiStepOption |    20,179.8 μs |     622.44 μs |   1,775.86 μs |    19,705.5 μs |   0.29 |    0.02 | 13437.5000 |       - |     - |  70399968 B |
-|                   MultiStepOption_NoBuilder |        MultiStepOption |    19,727.8 μs |     469.72 μs |   1,362.75 μs |    19,395.3 μs |   0.32 |    0.02 | 13437.5000 |       - |     - |  70399968 B |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-|             MultiStepValueOption_OldBuilder |   MultiStepValueOption |    47,237.3 μs |     909.93 μs |     759.83 μs |    47,211.0 μs |   1.00 |    0.00 | 19090.9091 |       - |     - | 100266664 B |
-|             MultiStepValueOption_NewBuilder |   MultiStepValueOption |     4,144.6 μs |      46.31 μs |      43.32 μs |     4,146.1 μs |   0.09 |    0.00 |          - |       - |     - |           - |
-|              MultiStepValueOption_NoBuilder |   MultiStepValueOption |     3,824.0 μs |      75.26 μs |      73.92 μs |     3,806.3 μs |   0.08 |    0.00 |          - |       - |     - |           - |
-|                                             |                        |                |               |               |                |        |         |            |         |       |             |
-| NestedForLoops_taskSeqUsingRawResumableCode |                taskSeq |       983.7 μs |      18.23 μs |      17.90 μs |       984.7 μs |   1.61 |    0.04 |    54.6875 |       - |     - |    295641 B |
-|        NestedForLoops_CSharpAsyncEnumerable |                taskSeq |       612.9 μs |      10.04 μs |       8.90 μs |       615.5 μs |   1.00 |    0.00 |    24.4141 |       - |     - |    131280 B |
diff --git a/docs/release-notes/.FSharp.Compiler.Service/8.0.200.md b/docs/release-notes/.FSharp.Compiler.Service/8.0.200.md
index 3eb14e5457c..701b6c0d2cc 100644
--- a/docs/release-notes/.FSharp.Compiler.Service/8.0.200.md
+++ b/docs/release-notes/.FSharp.Compiler.Service/8.0.200.md
@@ -6,6 +6,7 @@
 * Limit a type to 65K methods, introduce a compile-time error if any class has over approx 64K methods in generated IL. ([Issue #16398](https://github.com/dotnet/fsharp/issues/16398), [#PR 16427](https://github.com/dotnet/fsharp/pull/16427))
 
 ### Added
+
 * Raise a new error when interfaces with auto properties are implemented on constructor-less types. ([PR #16352](https://github.com/dotnet/fsharp/pull/16352))
 * Allow usage of `[<TailCall>]` with older `FSharp.Core` package versions. ([PR #16373](https://github.com/dotnet/fsharp/pull/16373))
 * Parser recovers on unfinished `as` patterns. ([PR #16404](https://github.com/dotnet/fsharp/pull/16404))
@@ -13,3 +14,4 @@
 * Parser recovers on unfinished enum case declarations. ([PR #16401](https://github.com/dotnet/fsharp/pull/16401))
 * Parser recovers on unfinished record declarations. ([PR #16357](https://github.com/dotnet/fsharp/pull/16357))
 * `MutableKeyword` to [SynFieldTrivia](../reference/fsharp-compiler-syntaxtrivia-synfieldtrivia.html) ([PR #16357](https://github.com/dotnet/fsharp/pull/16357))
+* Added support for a new parameterless constructor for `CustomOperationAttribute`, which, when applied, will use method name as keyword for custom operation in computation expression builder. ([PR #16475](https://github.com/dotnet/fsharp/pull/16475), part of implementation for [fslang-suggestions/1250](https://github.com/fsharp/fslang-suggestions/issues/1250))
diff --git a/docs/release-notes/.FSharp.Core/8.0.200.md b/docs/release-notes/.FSharp.Core/8.0.200.md
index e927a03a062..8a1feafaf64 100644
--- a/docs/release-notes/.FSharp.Core/8.0.200.md
+++ b/docs/release-notes/.FSharp.Core/8.0.200.md
@@ -1,3 +1,4 @@
 ### Added
 
 * More inlines for Result module. ([PR #16106](https://github.com/dotnet/fsharp/pull/16106))
+* Added a new parameterless constructor for `CustomOperationAttribute` ([PR #16475](https://github.com/dotnet/fsharp/pull/16475), part of implementation for [fslang-suggestions/1250](https://github.com/fsharp/fslang-suggestions/issues/1250))
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 14e96dddae8..3bc3d87f36a 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.23611.3">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.24052.1">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>229464299759d6667e8b907d9c321d31a8dcc123</Sha>
+      <Sha>5357f2bafb9e23858aa57136d38dbb113cdf81a2</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.SourceBuild.Intermediate.msbuild" Version="17.7.0-preview-23217-02">
@@ -39,25 +39,25 @@
       <Sha>194f32828726c3f1f63f79f3dc09b9e99c157b11</Sha>
       <SourceBuild RepoName="xliff-tasks" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="optimization.windows_nt-x64.MIBC.Runtime" Version="1.0.0-prerelease.23602.3">
+    <Dependency Name="optimization.windows_nt-x64.MIBC.Runtime" Version="1.0.0-prerelease.23614.4">
       <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-optimization</Uri>
-      <Sha>9ecde9217bbd3541f1a9dc2d684b9acfa5f27274</Sha>
+      <Sha>15f6d606bfc7cbb65587dd7bc1ec6e9ef283f7e3</Sha>
     </Dependency>
-    <Dependency Name="optimization.windows_nt-x86.MIBC.Runtime" Version="1.0.0-prerelease.23602.3">
+    <Dependency Name="optimization.windows_nt-x86.MIBC.Runtime" Version="1.0.0-prerelease.23614.4">
       <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-optimization</Uri>
-      <Sha>9ecde9217bbd3541f1a9dc2d684b9acfa5f27274</Sha>
+      <Sha>15f6d606bfc7cbb65587dd7bc1ec6e9ef283f7e3</Sha>
     </Dependency>
-    <Dependency Name="optimization.linux-x64.MIBC.Runtime" Version="1.0.0-prerelease.23602.3">
+    <Dependency Name="optimization.linux-x64.MIBC.Runtime" Version="1.0.0-prerelease.23614.4">
       <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-optimization</Uri>
-      <Sha>9ecde9217bbd3541f1a9dc2d684b9acfa5f27274</Sha>
+      <Sha>15f6d606bfc7cbb65587dd7bc1ec6e9ef283f7e3</Sha>
     </Dependency>
-    <Dependency Name="optimization.windows_nt-arm64.MIBC.Runtime" Version="1.0.0-prerelease.23602.3">
+    <Dependency Name="optimization.windows_nt-arm64.MIBC.Runtime" Version="1.0.0-prerelease.23614.4">
       <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-optimization</Uri>
-      <Sha>9ecde9217bbd3541f1a9dc2d684b9acfa5f27274</Sha>
+      <Sha>15f6d606bfc7cbb65587dd7bc1ec6e9ef283f7e3</Sha>
     </Dependency>
-    <Dependency Name="optimization.linux-arm64.MIBC.Runtime" Version="1.0.0-prerelease.23602.3">
+    <Dependency Name="optimization.linux-arm64.MIBC.Runtime" Version="1.0.0-prerelease.23614.4">
       <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-optimization</Uri>
-      <Sha>9ecde9217bbd3541f1a9dc2d684b9acfa5f27274</Sha>
+      <Sha>15f6d606bfc7cbb65587dd7bc1ec6e9ef283f7e3</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>
diff --git a/eng/Versions.props b/eng/Versions.props
index 04157283651..b99935c8056 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -209,10 +209,10 @@
     <HumanizerCoreVersion>2.2.0</HumanizerCoreVersion>
     <MicrosoftDotNetXliffTasksVersion>1.0.0-beta.23426.1</MicrosoftDotNetXliffTasksVersion>
     <!-- MIBC profile packages -->
-    <optimizationwindows_ntx64MIBCRuntimeVersion>1.0.0-prerelease.23602.3</optimizationwindows_ntx64MIBCRuntimeVersion>
-    <optimizationwindows_ntx86MIBCRuntimeVersion>1.0.0-prerelease.23602.3</optimizationwindows_ntx86MIBCRuntimeVersion>
-    <optimizationwindows_ntarm64MIBCRuntimeVersion>1.0.0-prerelease.23602.3</optimizationwindows_ntarm64MIBCRuntimeVersion>
-    <optimizationlinuxx64MIBCRuntimeVersion>1.0.0-prerelease.23602.3</optimizationlinuxx64MIBCRuntimeVersion>
-    <optimizationlinuxarm64MIBCRuntimeVersion>1.0.0-prerelease.23602.3</optimizationlinuxarm64MIBCRuntimeVersion>
+    <optimizationwindows_ntx64MIBCRuntimeVersion>1.0.0-prerelease.23614.4</optimizationwindows_ntx64MIBCRuntimeVersion>
+    <optimizationwindows_ntx86MIBCRuntimeVersion>1.0.0-prerelease.23614.4</optimizationwindows_ntx86MIBCRuntimeVersion>
+    <optimizationwindows_ntarm64MIBCRuntimeVersion>1.0.0-prerelease.23614.4</optimizationwindows_ntarm64MIBCRuntimeVersion>
+    <optimizationlinuxx64MIBCRuntimeVersion>1.0.0-prerelease.23614.4</optimizationlinuxx64MIBCRuntimeVersion>
+    <optimizationlinuxarm64MIBCRuntimeVersion>1.0.0-prerelease.23614.4</optimizationlinuxarm64MIBCRuntimeVersion>
   </PropertyGroup>
 </Project>
diff --git a/src/Compiler/Checking/AttributeChecking.fs b/src/Compiler/Checking/AttributeChecking.fs
index 2f02f794e8b..2564a54bdd3 100644
--- a/src/Compiler/Checking/AttributeChecking.fs
+++ b/src/Compiler/Checking/AttributeChecking.fs
@@ -207,7 +207,7 @@ let TryBindMethInfoAttribute g (m: range) (AttribInfo(atref, _) as attribSpec) m
         (fun provAttribs -> 
             match provAttribs.PUntaint((fun a -> a.GetAttributeConstructorArgs(provAttribs.TypeProvider.PUntaintNoFailure(id), atref.FullName)), m) with
             | Some args -> f3 args
-            | None -> None)  
+            | None -> None)
 #else
         (fun _provAttribs -> None)
 #endif
diff --git a/src/Compiler/Checking/CheckComputationExpressions.fs b/src/Compiler/Checking/CheckComputationExpressions.fs
index 2dfee741233..f1900f7a166 100644
--- a/src/Compiler/Checking/CheckComputationExpressions.fs
+++ b/src/Compiler/Checking/CheckComputationExpressions.fs
@@ -266,14 +266,25 @@ let TcComputationExpression (cenv: cenv) env (overallTy: OverallTy) tpenv (mWhol
     /// Decide if the builder is an auto-quote builder
     let isAutoQuote = hasMethInfo "Quote"
 
-    let customOperationMethods = 
+    let customOperationMethods =
         AllMethInfosOfTypeInScope ResultCollectionSettings.AllResults cenv.infoReader env.NameEnv None ad IgnoreOverrides mBuilderVal builderTy
-        |> List.choose (fun methInfo -> 
+        |> List.choose (fun methInfo ->
                 if not (IsMethInfoAccessible cenv.amap mBuilderVal ad methInfo) then None else
-                let nameSearch = 
-                    TryBindMethInfoAttribute cenv.g mBuilderVal cenv.g.attrib_CustomOperationAttribute methInfo 
+                let nameSearch =
+                    TryBindMethInfoAttribute cenv.g mBuilderVal cenv.g.attrib_CustomOperationAttribute methInfo
                         IgnoreAttribute // We do not respect this attribute for IL methods
-                        (function Attrib(_, _, [ AttribStringArg msg ], _, _, _, _) -> Some msg | _ -> None)
+                        (fun attr ->
+                            // NOTE: right now, we support of custom operations with spaces in them ([<CustomOperation("foo bar")>])
+                            // In the parameterless CustomOperationAttribute - we use the method name, and also allow it to be ````-quoted (member _.``foo bar`` _ = ...)
+                            match attr with
+                            // Empty string and parameterless constructor - we use the method name
+                            | Attrib(_, _, [ AttribStringArg "" ], _, _, _, _) // Empty string as parameter
+                            | Attrib(_, _, [ ], _, _, _, _) -> // No parameters, same as empty string for compat reasons.
+                                Some methInfo.LogicalName
+                            // Use the specified name
+                            | Attrib(_, _, [ AttribStringArg msg ], _, _, _, _) ->
+                                Some msg
+                            | _ -> None)
                         IgnoreAttribute // We do not respect this attribute for provided methods
 
                 match nameSearch with
diff --git a/src/FSharp.Core/prim-types.fs b/src/FSharp.Core/prim-types.fs
index 7693d7e6441..6d6eaf10a5c 100644
--- a/src/FSharp.Core/prim-types.fs
+++ b/src/FSharp.Core/prim-types.fs
@@ -287,6 +287,7 @@ namespace Microsoft.FSharp.Core
         let mutable maintainsVarSpace = false
         let mutable maintainsVarSpaceWithBind = false
         let mutable joinOnWord = ""
+        new() = CustomOperationAttribute("")
         member _.Name = name
         member _.AllowIntoPattern with get() = allowInto and set v = allowInto <- v
         member _.IsLikeZip with get() = isBinary and set v = isBinary <- v
diff --git a/src/FSharp.Core/prim-types.fsi b/src/FSharp.Core/prim-types.fsi
index 1daa1017737..655a31a8c87 100644
--- a/src/FSharp.Core/prim-types.fsi
+++ b/src/FSharp.Core/prim-types.fsi
@@ -420,6 +420,10 @@ namespace Microsoft.FSharp.Core
         /// <returns>CustomOperationAttribute</returns>
         new: name:string -> CustomOperationAttribute
 
+        /// <summary>Create an instance of attribute with empty name</summary>
+        /// <returns>CustomOperationAttribute</returns>
+        new: unit -> CustomOperationAttribute
+
         /// <summary>Get the name of the custom operation when used in a query or other computation expression</summary>
         member Name: string
 
diff --git a/tests/FSharp.Compiler.ComponentTests/Conformance/Expressions/ComputationExpressions/CustomOperations.fs b/tests/FSharp.Compiler.ComponentTests/Conformance/Expressions/ComputationExpressions/CustomOperations.fs
new file mode 100644
index 00000000000..28e9ff22c7a
--- /dev/null
+++ b/tests/FSharp.Compiler.ComponentTests/Conformance/Expressions/ComputationExpressions/CustomOperations.fs
@@ -0,0 +1,43 @@
+namespace Conformance.Expressions.ComputationExpressions
+
+open Xunit
+open FSharp.Test.Compiler
+
+module CustomOperations =
+
+    [<Fact>]
+    let ``[<CustomOperation>] without explicit name is allowed, uses method name as operation name`` () =
+        FSharp """
+            module CustomOperationTest
+            type CBuilder() =
+                [<CustomOperation>]
+                member this.Foo _ = "Foo"
+                [<CustomOperation>]
+                member this.foo _ = "foo"
+                [<CustomOperation("")>]
+                member this.bar _ = "bar"
+                member this.Yield _ = ()
+                member this.Zero _ = ()
+
+
+            [<EntryPoint>]
+            let main _ =
+                let cb = CBuilder()
+
+                let x = cb { Foo }
+                let y = cb { foo }
+                let z = cb { bar }
+                printfn $"{x}"
+                printfn $"{y}"
+
+                if x <> "Foo" then
+                    failwith "not Foo"
+                if y <> "foo" then
+                    failwith "not foo"
+                if z <> "bar" then
+                    failwith "not bar"
+                0
+        """
+        |> asExe
+        |> compileAndRun
+        |> shouldSucceed
\ No newline at end of file
diff --git a/tests/FSharp.Compiler.ComponentTests/FSharp.Compiler.ComponentTests.fsproj b/tests/FSharp.Compiler.ComponentTests/FSharp.Compiler.ComponentTests.fsproj
index a46a34a1160..904fbbf731c 100644
--- a/tests/FSharp.Compiler.ComponentTests/FSharp.Compiler.ComponentTests.fsproj
+++ b/tests/FSharp.Compiler.ComponentTests/FSharp.Compiler.ComponentTests.fsproj
@@ -31,53 +31,77 @@
       <Link>FsUnit.fs</Link>
     </Compile>
     <Compile Include="Conformance\BasicGrammarElements\AccessibilityAnnotations\Basic\Basic.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\AccessibilityAnnotations\OnOverridesAndIFaceImpl\OnOverridesAndIFaceImpl.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\AccessibilityAnnotations\OnTypeMembers\OnTypeMembers.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\AccessibilityAnnotations\PermittedLocations\PermittedLocations.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\CustomAttributes\AttributeInheritance\AttributeInheritance.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\CustomAttributes\AttributeUsage\AttributeUsage.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\AccessibilityAnnotations\OnOverridesAndIFaceImpl\OnOverridesAndIFaceImpl.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\AccessibilityAnnotations\OnTypeMembers\OnTypeMembers.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\AccessibilityAnnotations\PermittedLocations\PermittedLocations.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\CustomAttributes\AttributeInheritance\AttributeInheritance.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\CustomAttributes\AttributeUsage\AttributeUsage.fs" />
     <Compile Include="Conformance\BasicGrammarElements\CustomAttributes\Basic\Basic.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\CustomAttributes\ImportedAttributes\ImportedAttributes.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\CustomAttributes\ArgumentsOfAllTypes\ArgumentsOfAllTypes.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\CustomAttributes\ImportedAttributes\ImportedAttributes.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\CustomAttributes\ArgumentsOfAllTypes\ArgumentsOfAllTypes.fs" />
     <Compile Include="Conformance\BasicGrammarElements\DelegateTypes\DelegateDefinition.fs" />
     <Compile Include="Conformance\BasicGrammarElements\EntryPoint\EntryPoint.fs" />
     <Compile Include="Conformance\BasicGrammarElements\Events\Basic\Basic.fs" />
     <Compile Include="Conformance\BasicGrammarElements\ExceptionDefinitions\ExceptionDefinitions.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\ExplicitObjectConstructors\ExplicitObjectConstructors.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\ExplicitObjectConstructors\ExplicitObjectConstructors.fs" />
     <Compile Include="Conformance\BasicGrammarElements\FieldMembers\FieldMembers.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\ImplicitObjectConstructors\ImplicitObjectConstructors.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\ImplicitObjectConstructors\ImplicitObjectConstructors.fs" />
     <Compile Include="Conformance\BasicGrammarElements\ImportDeclarations\ImportDeclarations.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\InterfaceSpecificationsAndImplementations\InterfaceSpecificationsAndImplementations.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\InterfaceSpecificationsAndImplementations\InterfaceSpecificationsAndImplementations.fs" />
     <Compile Include="Conformance\BasicGrammarElements\LetBindings\Basic\Basic.fs" />
     <Compile Include="Conformance\BasicGrammarElements\LetBindings\TypeFunctions\TypeFunctions.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\LetBindings\ActivePatternBindings\ActivePatternBindings.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\LetBindings\ExplicitTypeParameters\ExplicitTypeParameters.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\LetBindings\ActivePatternBindings\ActivePatternBindings.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\LetBindings\ExplicitTypeParameters\ExplicitTypeParameters.fs" />
     <Compile Include="Conformance\BasicGrammarElements\MemberDefinitions\MemberDefinitions.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\MemberDefinitions\ImplementingDispatchSlots\ImplementingDispatchSlots.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\MemberDefinitions\MethodsAndProperties\MethodsAndProperties.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\MemberDefinitions\NamedArguments\NamedArguments.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\MemberDefinitions\OptionalArguments\OptionalArguments.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\MemberDefinitions\OptionalDefaultParamArgs\OptionalDefaultParamArgs.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\MemberDefinitions\OverloadingMembers\OverloadingMembers.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\MemberDefinitions\ImplementingDispatchSlots\ImplementingDispatchSlots.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\MemberDefinitions\MethodsAndProperties\MethodsAndProperties.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\MemberDefinitions\NamedArguments\NamedArguments.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\MemberDefinitions\OptionalArguments\OptionalArguments.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\MemberDefinitions\OptionalDefaultParamArgs\OptionalDefaultParamArgs.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\MemberDefinitions\OverloadingMembers\OverloadingMembers.fs" />
     <Compile Include="Conformance\BasicGrammarElements\MethodResolution.fs" />
     <Compile Include="Conformance\BasicGrammarElements\ModuleAbbreviations\ModuleAbbreviations.fs" />
     <Compile Include="Conformance\BasicGrammarElements\ModuleDefinitions\ModuleDefinitions.fs" />
     <Compile Include="Conformance\BasicGrammarElements\NamespaceDeclGroups\NamespaceDeclGroups.fs" />
     <Compile Include="Conformance\BasicGrammarElements\NullRepresentations\NullRepresentations.fs" />
     <Compile Include="Conformance\BasicGrammarElements\OperatorNames\OperatorNames.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\PrecedenceAndOperators\PrecedenceAndOperators.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\PrecedenceAndOperators\PrecedenceAndOperators.fs" />
     <Compile Include="Conformance\BasicGrammarElements\StaticLet\StaticLetInUnionsAndRecords.fs" />
     <Compile Include="Conformance\BasicGrammarElements\TypeAbbreviations\TypeAbbreviations.fs" />
-    <Compile Include="Conformance\BasicGrammarElements\TypeAbbreviations\WarnForAutoOpenAttributeAlias.fs" />
+    <Compile
+      Include="Conformance\BasicGrammarElements\TypeAbbreviations\WarnForAutoOpenAttributeAlias.fs" />
     <Compile Include="Conformance\BasicGrammarElements\ValueRestriction\ValueRestriction.fs" />
     <Compile Include="Conformance\BasicGrammarElements\UseBindings\UseBindings.fs" />
-	<Compile Include="Conformance\Constraints\Unmanaged.fs" />
-    <Compile Include="Conformance\GeneratedEqualityHashingComparison\Attributes\Diags\Attributes_Diags.fs" />
-    <Compile Include="Conformance\GeneratedEqualityHashingComparison\Attributes\Legacy\Attributes_Legacy.fs" />
+    <Compile Include="Conformance\Constraints\Unmanaged.fs" />
+    <Compile
+      Include="Conformance\GeneratedEqualityHashingComparison\Attributes\Diags\Attributes_Diags.fs" />
+    <Compile
+      Include="Conformance\GeneratedEqualityHashingComparison\Attributes\Legacy\Attributes_Legacy.fs" />
     <Compile Include="Conformance\GeneratedEqualityHashingComparison\Basic\Basic.fs" />
     <Compile Include="Conformance\GeneratedEqualityHashingComparison\IComparison\IComparison.fs" />
-    <Compile Include="Conformance\Expressions\ApplicationExpressions\BasicApplication\BasicApplication.fs" />
+    <Compile
+      Include="Conformance\Expressions\ApplicationExpressions\BasicApplication\BasicApplication.fs" />
     <Compile Include="Conformance\Expressions\BindingExpressions\BindingExpressions.fs" />
+    <Compile Include="Conformance\Expressions\ComputationExpressions\CustomOperations.fs" />
     <Compile Include="Conformance\Expressions\ObjectExpressions\ObjectExpressions.fs" />
     <Compile Include="Conformance\Expressions\ControlFlowExpressions\PatternMatching\PatternMatching.fs" />
     <Compile Include="Conformance\Expressions\ControlFlowExpressions\SequenceIteration\SequenceIteration.fs" />
diff --git a/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard20.debug.bsl b/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard20.debug.bsl
index e677bf9a8c7..5a36ea3c288 100644
--- a/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard20.debug.bsl
+++ b/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard20.debug.bsl
@@ -950,6 +950,7 @@ Microsoft.FSharp.Core.CustomOperationAttribute: System.String JoinConditionWord
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String Name
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String get_JoinConditionWord()
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String get_Name()
+Microsoft.FSharp.Core.CustomOperationAttribute: Void .ctor()
 Microsoft.FSharp.Core.CustomOperationAttribute: Void .ctor(System.String)
 Microsoft.FSharp.Core.CustomOperationAttribute: Void set_AllowIntoPattern(Boolean)
 Microsoft.FSharp.Core.CustomOperationAttribute: Void set_IsLikeGroupJoin(Boolean)
diff --git a/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard20.release.bsl b/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard20.release.bsl
index 0d4c37a6541..b4cb84825db 100644
--- a/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard20.release.bsl
+++ b/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard20.release.bsl
@@ -952,6 +952,7 @@ Microsoft.FSharp.Core.CustomOperationAttribute: System.String JoinConditionWord
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String Name
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String get_JoinConditionWord()
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String get_Name()
+Microsoft.FSharp.Core.CustomOperationAttribute: Void .ctor()
 Microsoft.FSharp.Core.CustomOperationAttribute: Void .ctor(System.String)
 Microsoft.FSharp.Core.CustomOperationAttribute: Void set_AllowIntoPattern(Boolean)
 Microsoft.FSharp.Core.CustomOperationAttribute: Void set_IsLikeGroupJoin(Boolean)
diff --git a/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard21.debug.bsl b/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard21.debug.bsl
index b6b6b11aae7..adc21566d87 100644
--- a/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard21.debug.bsl
+++ b/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard21.debug.bsl
@@ -672,12 +672,14 @@ Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Microsoft.FSharp.Contro
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Microsoft.FSharp.Control.FSharpAsync`1[T] Scan[T](Microsoft.FSharp.Core.FSharpFunc`2[TMsg,Microsoft.FSharp.Core.FSharpOption`1[Microsoft.FSharp.Control.FSharpAsync`1[T]]], Microsoft.FSharp.Core.FSharpOption`1[System.Int32])
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Microsoft.FSharp.Control.FSharpHandler`1[System.Exception] Error
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg] Start(Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg],Microsoft.FSharp.Control.FSharpAsync`1[Microsoft.FSharp.Core.Unit]], Microsoft.FSharp.Core.FSharpOption`1[System.Threading.CancellationToken])
+Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg] StartImmediate(Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg],Microsoft.FSharp.Control.FSharpAsync`1[Microsoft.FSharp.Core.Unit]], Microsoft.FSharp.Core.FSharpOption`1[System.Threading.CancellationToken])
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Microsoft.FSharp.Core.FSharpOption`1[TReply] TryPostAndReply[TReply](Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.FSharpAsyncReplyChannel`1[TReply],TMsg], Microsoft.FSharp.Core.FSharpOption`1[System.Int32])
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: TReply PostAndReply[TReply](Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.FSharpAsyncReplyChannel`1[TReply],TMsg], Microsoft.FSharp.Core.FSharpOption`1[System.Int32])
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Void .ctor(Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg],Microsoft.FSharp.Control.FSharpAsync`1[Microsoft.FSharp.Core.Unit]], Microsoft.FSharp.Core.FSharpOption`1[System.Threading.CancellationToken])
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Void Dispose()
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Void Post(TMsg)
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Void Start()
+Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Void StartImmediate()
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Void add_Error(Microsoft.FSharp.Control.FSharpHandler`1[System.Exception])
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Void remove_Error(Microsoft.FSharp.Control.FSharpHandler`1[System.Exception])
 Microsoft.FSharp.Control.FSharpMailboxProcessor`1[TMsg]: Void set_DefaultTimeout(Int32)
@@ -951,6 +953,7 @@ Microsoft.FSharp.Core.CustomOperationAttribute: System.String JoinConditionWord
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String Name
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String get_JoinConditionWord()
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String get_Name()
+Microsoft.FSharp.Core.CustomOperationAttribute: Void .ctor()
 Microsoft.FSharp.Core.CustomOperationAttribute: Void .ctor(System.String)
 Microsoft.FSharp.Core.CustomOperationAttribute: Void set_AllowIntoPattern(Boolean)
 Microsoft.FSharp.Core.CustomOperationAttribute: Void set_IsLikeGroupJoin(Boolean)
diff --git a/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard21.release.bsl b/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard21.release.bsl
index baecd0a2364..eba99c47dec 100644
--- a/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard21.release.bsl
+++ b/tests/FSharp.Core.UnitTests/FSharp.Core.SurfaceArea.netstandard21.release.bsl
@@ -953,6 +953,7 @@ Microsoft.FSharp.Core.CustomOperationAttribute: System.String JoinConditionWord
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String Name
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String get_JoinConditionWord()
 Microsoft.FSharp.Core.CustomOperationAttribute: System.String get_Name()
+Microsoft.FSharp.Core.CustomOperationAttribute: Void .ctor()
 Microsoft.FSharp.Core.CustomOperationAttribute: Void .ctor(System.String)
 Microsoft.FSharp.Core.CustomOperationAttribute: Void set_AllowIntoPattern(Boolean)
 Microsoft.FSharp.Core.CustomOperationAttribute: Void set_IsLikeGroupJoin(Boolean)
diff --git a/tests/benchmarks/CompiledCodeBenchmarks/TaskPerf/TaskPerfPreviousCompiler/TaskPerfPreviousCompiler.fsproj b/tests/benchmarks/CompiledCodeBenchmarks/TaskPerf/TaskPerfPreviousCompiler/TaskPerfPreviousCompiler.fsproj
deleted file mode 100644
index b71c47ac821..00000000000
--- a/tests/benchmarks/CompiledCodeBenchmarks/TaskPerf/TaskPerfPreviousCompiler/TaskPerfPreviousCompiler.fsproj
+++ /dev/null
@@ -1,30 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
-    <OutputType>Exe</OutputType>
-    <DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
-	<OtherFlags>$(OtherFlags) --define:ASYNC_PERF</OtherFlags>
-	<DisableAutoSetFscCompilerPath>true</DisableAutoSetFscCompilerPath>
-
-	<FscToolPath>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\CommonExtensions\Microsoft\FSharp</FscToolPath>
-	<FscToolExe>fsc.exe</FscToolExe>
-	<DotnetFscCompilerPath></DotnetFscCompilerPath>
-  </PropertyGroup>
-
-  <ItemGroup>
-	<Compile Include="defs.fs" />
-	<Compile Include="..\TaskPerf\sync.fs" />
-	<Compile Include="..\TaskPerf\array.fs" />
-	<Compile Include="..\TaskPerf\option.fs" />
-	<Compile Include="..\TaskPerf\TaskBuilder.fs" />
-	<Compile Include="..\TaskPerf\TaskPerf.fs" />
-    <PackageReference Include="FSharp.Core" Version="5.0.1" />
-	<ProjectReference Include="..\TaskPerfCSharp\TaskPerfCSharp.csproj" />
-	<PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
-     <!-- this must be manually enabled because CI fails because some post-build checks don't like the DLL-->
-	  <!-- <PackageReference Include="FSharp.Control.AsyncSeq" Version="3.0.3" />  -->
-    <PackageReference Include="System.Interactive.Async" Version="4.1.1" />
-  </ItemGroup>
-
-</Project>
diff --git a/tests/benchmarks/CompiledCodeBenchmarks/TaskPerf/TaskPerfPreviousCompiler/defs.fs b/tests/benchmarks/CompiledCodeBenchmarks/TaskPerf/TaskPerfPreviousCompiler/defs.fs
deleted file mode 100644
index 42cea70022c..00000000000
--- a/tests/benchmarks/CompiledCodeBenchmarks/TaskPerf/TaskPerfPreviousCompiler/defs.fs
+++ /dev/null
@@ -1,14 +0,0 @@
-
-namespace Tests
-
-open System
-
-#if !PREVIEW
-
-[<AttributeUsage (AttributeTargets.Parameter,AllowMultiple=false)>]  
-[<Sealed>]
-type InlineIfLambdaAttribute() = 
-    inherit Attribute()
-
-#endif
-
diff --git a/tests/projects/Sample_Local_Compiler_and_FSLib/LocalCompilerAndFslib.fsproj b/tests/projects/Sample_Local_Compiler_and_FSLib/LocalCompilerAndFslib.fsproj
new file mode 100644
index 00000000000..c2164b65666
--- /dev/null
+++ b/tests/projects/Sample_Local_Compiler_and_FSLib/LocalCompilerAndFslib.fsproj
@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <LangVersion>preview</LangVersion>
+    <DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <DisableAutoSetFscCompilerPath>true</DisableAutoSetFscCompilerPath>
+    <DotnetFscCompilerPath>$(MSBuildThisFileDirectory)../../../artifacts/bin/fsc/Debug/net8.0/fsc.dll</DotnetFscCompilerPath>
+    <Fsc_DotNET_DotnetFscCompilerPath>$(MSBuildThisFileDirectory)../../../artifacts/bin/fsc/Debug/net8.0/fsc.dll</Fsc_DotNET_DotnetFscCompilerPath>
+    <FSharpPreferNetFrameworkTools>False</FSharpPreferNetFrameworkTools>
+    <FSharpPrefer64BitTools>True</FSharpPrefer64BitTools>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Reference Include="$(MSBuildThisFileDirectory)../../../artifacts/bin/FSharp.Core/Debug/netstandard2.0/FSharp.Core.dll" />
+    <Compile Include="Program.fs" />
+  </ItemGroup>
+
+</Project>
diff --git a/tests/projects/Sample_Local_Compiler_and_FSLib/Program.fs b/tests/projects/Sample_Local_Compiler_and_FSLib/Program.fs
new file mode 100644
index 00000000000..1ffa8063569
--- /dev/null
+++ b/tests/projects/Sample_Local_Compiler_and_FSLib/Program.fs
@@ -0,0 +1,25 @@
+module Program
+
+type CBuilder() =
+    [<CustomOperation>]
+    member this.Foo _ = "Foo"
+    [<CustomOperation>]
+    member this.foo _ = "foo"
+    member this.Yield _ = ()
+    member this.Zero _ = ()
+
+
+[<EntryPoint>]
+let main _ =
+    let cb = CBuilder()
+
+    let x = cb { Foo }
+    let y = cb { foo }
+    printfn $"{x}"
+    printfn $"{y}"
+
+    if x <> "Foo" then
+        failwith "not Foo"
+    if y <> "foo" then
+        failwith "not foo"
+    0
diff --git a/vsintegration/readme.md b/vsintegration/readme.md
index 4f929238bdc..b09865b8149 100644
--- a/vsintegration/readme.md
+++ b/vsintegration/readme.md
@@ -12,6 +12,10 @@ Top-level project for the Visual F# IDE tools.  This project contains the follow
 
 In general, if something is implemented here and the logic becomes rather lengthy, it may be a good idea to push that logic down into the F# Compiler Service so that other editors can benefit.
 
+# src/FSharp.VS.FSI
+
+F# Interactive implementation.
+
 # src/FSharp.UIResources
 
 GUI controls and resources for Visual F# tooling.