Pass through parameters for #if item parsing

Pass through `isAtTopLevel` and `allowInitDecl`
parameters, which allow for better diagnostics.

Author: hamishknight

Sources/SwiftParser/TopLevel.swift

@@ -229,7 +229,7 @@ extension Parser {
       // If config of attributes is parsed as part of declaration parsing as it
       // doesn't constitute its own code block item.
       let directive = self.parsePoundIfDirective { (parser, _) in
-        parser.parseCodeBlockItem(isAtTopLevel: false, allowInitDecl: true)
+        parser.parseCodeBlockItem(isAtTopLevel: isAtTopLevel, allowInitDecl: allowInitDecl)
       } addSemicolonIfNeeded: { lastElement, newItemAtStartOfLine, parser in
         if lastElement.semicolon == nil && !newItemAtStartOfLine {
           return RawCodeBlockItemSyntax(

Tests/SwiftParserTest/ExpressionTests.swift

@@ -1820,7 +1820,7 @@ final class StatementExpressionTests: XCTestCase {
       ]
     )
   }
-  
+
   func testConsecutiveStatements2() {
     assertParse(
       "switch x {case y: a1️⃣ b2️⃣ c}",
@@ -1830,7 +1830,7 @@ final class StatementExpressionTests: XCTestCase {
       ]
     )
   }
-  
+
   func testConsecutiveStatements3() {
     assertParse(
       """
@@ -1842,7 +1842,7 @@ final class StatementExpressionTests: XCTestCase {
       ]
     )
   }
-  
+
   func testConsecutiveStatements4() {
     assertParse(
       """
@@ -1855,6 +1855,43 @@ final class StatementExpressionTests: XCTestCase {
     )
   }
 
+  func testInitCallInPoundIf() {
+    // Make sure we parse 'init()' as an expr, not a decl.
+    assertParse(
+      """
+      class C {
+      init() {
+      #if true
+        init()
+      #endif
+      }
+      }
+      """,
+      substructure: Syntax(
+        FunctionCallExprSyntax(
+          calledExpression: IdentifierExprSyntax(identifier: .keyword(.init("init")!)),
+          leftParen: .leftParenToken(),
+          argumentList: TupleExprElementListSyntax([]),
+          rightParen: .rightParenToken()
+        )
+      )
+    )
+  }
+
+  func testUnexpectedCloseBraceInPoundIf() {
+    assertParse(
+      """
+      #if true
+      1️⃣}
+      class C {}
+      #endif
+      """,
+      diagnostics: [
+        DiagnosticSpec(message: "unexpected brace before class")
+      ]
+    )
+  }
+
   func testStringLiteralAfterKeyPath() {
     AssertParse(
       #"""