diff --git a/src/Compiler/Checking/CheckExpressions.fs b/src/Compiler/Checking/CheckExpressions.fs
index a1cb3b8063b..7d7ba39a0e4 100644
--- a/src/Compiler/Checking/CheckExpressions.fs
+++ b/src/Compiler/Checking/CheckExpressions.fs
@@ -4369,6 +4369,9 @@ and TcTypeOrMeasure kindOpt (cenv: cenv) newOk checkConstraints occ (iwsam: Warn
         // The inner types are expected to be collected by (|TypesForTypar|) at this point.
         error(Error((FSComp.SR.tcSynTypeOrInvalidInDeclaration()), m))
 
+    | SynType.FromParseError _ ->
+        NewErrorType (), tpenv
+
 and CheckIWSAM (cenv: cenv) (env: TcEnv) checkConstraints iwsam m tcref =
     let g = cenv.g
     let ty = generalizedTyconRef g tcref
@@ -4561,6 +4564,10 @@ and TcTypeMeasureApp kindOpt (cenv: cenv) newOk checkConstraints occ env tpenv a
         | _ ->
             errorR(Error(FSComp.SR.tcTypeParameterInvalidAsTypeConstructor(), m))
             NewErrorType (), tpenv
+
+    | StripParenTypes(SynType.FromParseError _) ->
+        NewErrorType (), tpenv
+
     | _ ->
         errorR(Error(FSComp.SR.tcIllegalSyntaxInTypeExpression(), m))
         NewErrorType (), tpenv
diff --git a/src/Compiler/Driver/GraphChecking/FileContentMapping.fs b/src/Compiler/Driver/GraphChecking/FileContentMapping.fs
index 12dd8b9c004..f20c95fa3d8 100644
--- a/src/Compiler/Driver/GraphChecking/FileContentMapping.fs
+++ b/src/Compiler/Driver/GraphChecking/FileContentMapping.fs
@@ -260,6 +260,7 @@ let visitSynType (t: SynType) : FileContentEntry list =
         | SynType.Or (lhsType, rhsType, _, _) ->
             let continuations = List.map visit [ lhsType; rhsType ]
             Continuation.concatenate continuations continuation
+        | SynType.FromParseError _ -> continuation []
 
     visit t id
 
diff --git a/src/Compiler/Service/ServiceParseTreeWalk.fs b/src/Compiler/Service/ServiceParseTreeWalk.fs
index 9c81e015460..d9e7cf13954 100644
--- a/src/Compiler/Service/ServiceParseTreeWalk.fs
+++ b/src/Compiler/Service/ServiceParseTreeWalk.fs
@@ -849,7 +849,8 @@ module SyntaxTraversal =
                 | SynType.AnonRecd _
                 | SynType.LongIdent _
                 | SynType.Var _
-                | SynType.StaticConstant _ -> None
+                | SynType.StaticConstant _
+                | SynType.FromParseError _ -> None
 
             visitor.VisitType(origPath, defaultTraverse, ty)
 
diff --git a/src/Compiler/Service/ServiceParsedInputOps.fs b/src/Compiler/Service/ServiceParsedInputOps.fs
index c7440012816..67f357943f0 100644
--- a/src/Compiler/Service/ServiceParsedInputOps.fs
+++ b/src/Compiler/Service/ServiceParsedInputOps.fs
@@ -685,7 +685,8 @@ module ParsedInput =
             | SynType.AnonRecd _
             | SynType.LongIdent _
             | SynType.Var _
-            | SynType.StaticConstant _ -> None
+            | SynType.StaticConstant _
+            | SynType.FromParseError _ -> None
 
         and walkClause clause =
             let (SynMatchClause (pat = pat; whenExpr = e1; resultExpr = e2)) = clause
@@ -1701,7 +1702,8 @@ module ParsedInput =
             | SynType.Anon _
             | SynType.AnonRecd _
             | SynType.Var _
-            | SynType.StaticConstant _ -> ()
+            | SynType.StaticConstant _
+            | SynType.FromParseError _ -> ()
 
         and walkClause (SynMatchClause (pat = pat; whenExpr = e1; resultExpr = e2)) =
             walkPat pat
diff --git a/src/Compiler/SyntaxTree/SyntaxTree.fs b/src/Compiler/SyntaxTree/SyntaxTree.fs
index 452d174c73c..c3dec3074f3 100644
--- a/src/Compiler/SyntaxTree/SyntaxTree.fs
+++ b/src/Compiler/SyntaxTree/SyntaxTree.fs
@@ -441,6 +441,8 @@ type SynType =
 
     | Or of lhsType: SynType * rhsType: SynType * range: range * trivia: SynTypeOrTrivia
 
+    | FromParseError of range: range
+
     member x.Range =
         match x with
         | SynType.App (range = m)
@@ -459,7 +461,8 @@ type SynType =
         | SynType.MeasurePower (range = m)
         | SynType.Paren (range = m)
         | SynType.SignatureParameter (range = m)
-        | SynType.Or (range = m) -> m
+        | SynType.Or (range = m)
+        | SynType.FromParseError (range = m) -> m
         | SynType.LongIdent lidwd -> lidwd.Range
 
 [<NoEquality; NoComparison; RequireQualifiedAccess>]
diff --git a/src/Compiler/SyntaxTree/SyntaxTree.fsi b/src/Compiler/SyntaxTree/SyntaxTree.fsi
index 575673804f5..575e13b8df7 100644
--- a/src/Compiler/SyntaxTree/SyntaxTree.fsi
+++ b/src/Compiler/SyntaxTree/SyntaxTree.fsi
@@ -518,6 +518,9 @@ type SynType =
     /// F# syntax: ^a or ^b, used in trait calls
     | Or of lhsType: SynType * rhsType: SynType * range: range * trivia: SynTypeOrTrivia
 
+    /// A type arising from a parse error
+    | FromParseError of range: range
+
     /// Gets the syntax range of this construct
     member Range: range
 
diff --git a/tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.debug.bsl b/tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.debug.bsl
index c9de7544463..74021c8c9ac 100644
--- a/tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.debug.bsl
+++ b/tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.debug.bsl
@@ -8389,6 +8389,8 @@ FSharp.Compiler.Syntax.SynType+Array: FSharp.Compiler.Text.Range get_range()
 FSharp.Compiler.Syntax.SynType+Array: FSharp.Compiler.Text.Range range
 FSharp.Compiler.Syntax.SynType+Array: Int32 get_rank()
 FSharp.Compiler.Syntax.SynType+Array: Int32 rank
+FSharp.Compiler.Syntax.SynType+FromParseError: FSharp.Compiler.Text.Range get_range()
+FSharp.Compiler.Syntax.SynType+FromParseError: FSharp.Compiler.Text.Range range
 FSharp.Compiler.Syntax.SynType+Fun: FSharp.Compiler.Syntax.SynType argType
 FSharp.Compiler.Syntax.SynType+Fun: FSharp.Compiler.Syntax.SynType get_argType()
 FSharp.Compiler.Syntax.SynType+Fun: FSharp.Compiler.Syntax.SynType get_returnType()
@@ -8463,6 +8465,7 @@ FSharp.Compiler.Syntax.SynType+Tags: Int32 Anon
 FSharp.Compiler.Syntax.SynType+Tags: Int32 AnonRecd
 FSharp.Compiler.Syntax.SynType+Tags: Int32 App
 FSharp.Compiler.Syntax.SynType+Tags: Int32 Array
+FSharp.Compiler.Syntax.SynType+Tags: Int32 FromParseError
 FSharp.Compiler.Syntax.SynType+Tags: Int32 Fun
 FSharp.Compiler.Syntax.SynType+Tags: Int32 HashConstraint
 FSharp.Compiler.Syntax.SynType+Tags: Int32 LongIdent
@@ -8497,6 +8500,7 @@ FSharp.Compiler.Syntax.SynType: Boolean IsAnon
 FSharp.Compiler.Syntax.SynType: Boolean IsAnonRecd
 FSharp.Compiler.Syntax.SynType: Boolean IsApp
 FSharp.Compiler.Syntax.SynType: Boolean IsArray
+FSharp.Compiler.Syntax.SynType: Boolean IsFromParseError
 FSharp.Compiler.Syntax.SynType: Boolean IsFun
 FSharp.Compiler.Syntax.SynType: Boolean IsHashConstraint
 FSharp.Compiler.Syntax.SynType: Boolean IsLongIdent
@@ -8515,6 +8519,7 @@ FSharp.Compiler.Syntax.SynType: Boolean get_IsAnon()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsAnonRecd()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsApp()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsArray()
+FSharp.Compiler.Syntax.SynType: Boolean get_IsFromParseError()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsFun()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsHashConstraint()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsLongIdent()
@@ -8533,6 +8538,7 @@ FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewAnon(FSharp.Co
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewAnonRecd(Boolean, Microsoft.FSharp.Collections.FSharpList`1[System.Tuple`2[FSharp.Compiler.Syntax.Ident,FSharp.Compiler.Syntax.SynType]], FSharp.Compiler.Text.Range)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewApp(FSharp.Compiler.Syntax.SynType, Microsoft.FSharp.Core.FSharpOption`1[FSharp.Compiler.Text.Range], Microsoft.FSharp.Collections.FSharpList`1[FSharp.Compiler.Syntax.SynType], Microsoft.FSharp.Collections.FSharpList`1[FSharp.Compiler.Text.Range], Microsoft.FSharp.Core.FSharpOption`1[FSharp.Compiler.Text.Range], Boolean, FSharp.Compiler.Text.Range)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewArray(Int32, FSharp.Compiler.Syntax.SynType, FSharp.Compiler.Text.Range)
+FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewFromParseError(FSharp.Compiler.Text.Range)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewFun(FSharp.Compiler.Syntax.SynType, FSharp.Compiler.Syntax.SynType, FSharp.Compiler.Text.Range, FSharp.Compiler.SyntaxTrivia.SynTypeFunTrivia)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewHashConstraint(FSharp.Compiler.Syntax.SynType, FSharp.Compiler.Text.Range)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewLongIdent(FSharp.Compiler.Syntax.SynLongIdent)
@@ -8551,6 +8557,7 @@ FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+Anon
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+AnonRecd
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+App
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+Array
+FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+FromParseError
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+Fun
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+HashConstraint
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+LongIdent
diff --git a/tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.release.bsl b/tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.release.bsl
index c9de7544463..74021c8c9ac 100644
--- a/tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.release.bsl
+++ b/tests/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.SurfaceArea.netstandard20.release.bsl
@@ -8389,6 +8389,8 @@ FSharp.Compiler.Syntax.SynType+Array: FSharp.Compiler.Text.Range get_range()
 FSharp.Compiler.Syntax.SynType+Array: FSharp.Compiler.Text.Range range
 FSharp.Compiler.Syntax.SynType+Array: Int32 get_rank()
 FSharp.Compiler.Syntax.SynType+Array: Int32 rank
+FSharp.Compiler.Syntax.SynType+FromParseError: FSharp.Compiler.Text.Range get_range()
+FSharp.Compiler.Syntax.SynType+FromParseError: FSharp.Compiler.Text.Range range
 FSharp.Compiler.Syntax.SynType+Fun: FSharp.Compiler.Syntax.SynType argType
 FSharp.Compiler.Syntax.SynType+Fun: FSharp.Compiler.Syntax.SynType get_argType()
 FSharp.Compiler.Syntax.SynType+Fun: FSharp.Compiler.Syntax.SynType get_returnType()
@@ -8463,6 +8465,7 @@ FSharp.Compiler.Syntax.SynType+Tags: Int32 Anon
 FSharp.Compiler.Syntax.SynType+Tags: Int32 AnonRecd
 FSharp.Compiler.Syntax.SynType+Tags: Int32 App
 FSharp.Compiler.Syntax.SynType+Tags: Int32 Array
+FSharp.Compiler.Syntax.SynType+Tags: Int32 FromParseError
 FSharp.Compiler.Syntax.SynType+Tags: Int32 Fun
 FSharp.Compiler.Syntax.SynType+Tags: Int32 HashConstraint
 FSharp.Compiler.Syntax.SynType+Tags: Int32 LongIdent
@@ -8497,6 +8500,7 @@ FSharp.Compiler.Syntax.SynType: Boolean IsAnon
 FSharp.Compiler.Syntax.SynType: Boolean IsAnonRecd
 FSharp.Compiler.Syntax.SynType: Boolean IsApp
 FSharp.Compiler.Syntax.SynType: Boolean IsArray
+FSharp.Compiler.Syntax.SynType: Boolean IsFromParseError
 FSharp.Compiler.Syntax.SynType: Boolean IsFun
 FSharp.Compiler.Syntax.SynType: Boolean IsHashConstraint
 FSharp.Compiler.Syntax.SynType: Boolean IsLongIdent
@@ -8515,6 +8519,7 @@ FSharp.Compiler.Syntax.SynType: Boolean get_IsAnon()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsAnonRecd()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsApp()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsArray()
+FSharp.Compiler.Syntax.SynType: Boolean get_IsFromParseError()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsFun()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsHashConstraint()
 FSharp.Compiler.Syntax.SynType: Boolean get_IsLongIdent()
@@ -8533,6 +8538,7 @@ FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewAnon(FSharp.Co
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewAnonRecd(Boolean, Microsoft.FSharp.Collections.FSharpList`1[System.Tuple`2[FSharp.Compiler.Syntax.Ident,FSharp.Compiler.Syntax.SynType]], FSharp.Compiler.Text.Range)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewApp(FSharp.Compiler.Syntax.SynType, Microsoft.FSharp.Core.FSharpOption`1[FSharp.Compiler.Text.Range], Microsoft.FSharp.Collections.FSharpList`1[FSharp.Compiler.Syntax.SynType], Microsoft.FSharp.Collections.FSharpList`1[FSharp.Compiler.Text.Range], Microsoft.FSharp.Core.FSharpOption`1[FSharp.Compiler.Text.Range], Boolean, FSharp.Compiler.Text.Range)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewArray(Int32, FSharp.Compiler.Syntax.SynType, FSharp.Compiler.Text.Range)
+FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewFromParseError(FSharp.Compiler.Text.Range)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewFun(FSharp.Compiler.Syntax.SynType, FSharp.Compiler.Syntax.SynType, FSharp.Compiler.Text.Range, FSharp.Compiler.SyntaxTrivia.SynTypeFunTrivia)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewHashConstraint(FSharp.Compiler.Syntax.SynType, FSharp.Compiler.Text.Range)
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType NewLongIdent(FSharp.Compiler.Syntax.SynLongIdent)
@@ -8551,6 +8557,7 @@ FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+Anon
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+AnonRecd
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+App
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+Array
+FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+FromParseError
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+Fun
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+HashConstraint
 FSharp.Compiler.Syntax.SynType: FSharp.Compiler.Syntax.SynType+LongIdent