Remove semantic hashbang error

Author: ahoppen

Tests/SwiftParserTest/Assertions.swift

@@ -443,6 +443,7 @@ func AssertParse(
   _ markedSource: String,
   substructure expectedSubstructure: Syntax? = nil,
   substructureAfterMarker: String = "START",
+  substructureCheckTrivia: Bool = false,
   diagnostics expectedDiagnostics: [DiagnosticSpec] = [],
   applyFixIts: [String]? = nil,
   fixedSource expectedFixedSource: String? = nil,
@@ -454,6 +455,7 @@ func AssertParse(
     { SourceFileSyntax.parse(from: &$0) },
     substructure: expectedSubstructure,
     substructureAfterMarker: substructureAfterMarker,
+    substructureCheckTrivia: substructureCheckTrivia,
     diagnostics: expectedDiagnostics,
     applyFixIts: applyFixIts,
     fixedSource: expectedFixedSource,
@@ -470,6 +472,7 @@ func AssertParse<S: SyntaxProtocol>(
   _ parse: (inout Parser) -> S,
   substructure expectedSubstructure: Syntax? = nil,
   substructureAfterMarker: String = "START",
+  substructureCheckTrivia: Bool = false,
   diagnostics expectedDiagnostics: [DiagnosticSpec] = [],
   applyFixIts: [String]? = nil,
   fixedSource expectedFixedSource: String? = nil,
@@ -484,6 +487,7 @@ func AssertParse<S: SyntaxProtocol>(
     },
     substructure: expectedSubstructure,
     substructureAfterMarker: substructureAfterMarker,
+    substructureCheckTrivia: substructureCheckTrivia,
     diagnostics: expectedDiagnostics,
     applyFixIts: applyFixIts,
     fixedSource: expectedFixedSource,
@@ -515,6 +519,7 @@ func AssertParse<S: SyntaxProtocol>(
   _ parse: (String) -> S,
   substructure expectedSubstructure: Syntax? = nil,
   substructureAfterMarker: String = "START",
+  substructureCheckTrivia: Bool = false,
   diagnostics expectedDiagnostics: [DiagnosticSpec] = [],
   applyFixIts: [String]? = nil,
   fixedSource expectedFixedSource: String? = nil,
@@ -545,7 +550,7 @@ func AssertParse<S: SyntaxProtocol>(
   if let expectedSubstructure = expectedSubstructure {
     let subtreeMatcher = SubtreeMatcher(Syntax(tree), markers: markerLocations)
     do {
-      try subtreeMatcher.assertSameStructure(afterMarker: substructureAfterMarker, Syntax(expectedSubstructure), file: file, line: line)
+      try subtreeMatcher.assertSameStructure(afterMarker: substructureAfterMarker, Syntax(expectedSubstructure), includeTrivia: substructureCheckTrivia, file: file, line: line)
     } catch {
       XCTFail("Matching for a subtree failed with error: \(error)", file: file, line: line)
     }

Tests/SwiftParserTest/translated/HashbangLibraryTests.swift

@@ -12,21 +12,59 @@
 
 // This test file has been translated from swift/test/Parse/hashbang_library.swift
 
+import SwiftSyntax
+
 import XCTest
 
 final class HashbangLibraryTests: XCTestCase {
   func testHashbangLibrary1() {
+    // Check that we diagnose and skip the hashbang at the beginning of the file
+    // when compiling in library mode.
     AssertParse(
       """
-      #!/usr/bin/swift 
+      #!/usr/bin/swift
       class Foo {}
-      // Check that we diagnose and skip the hashbang at the beginning of the file
-      // when compiling in library mode.
       """,
-      diagnostics: [
-        // TODO: Old parser expected error on line 1: hashbang line is allowed only in the main file
-      ]
+      substructure: Syntax(
+        SourceFileSyntax(
+          statements: CodeBlockItemListSyntax([
+            CodeBlockItemSyntax(
+              item: .decl(
+                DeclSyntax(
+                  ClassDeclSyntax(
+                    attributes: nil,
+                    modifiers: nil,
+                    classKeyword: .keyword(
+                      .class,
+                      leadingTrivia: [
+                        .shebang("#!/usr/bin/swift"),
+                        .newlines(1),
+                      ],
+                      trailingTrivia: .space
+                    ),
+                    identifier: .identifier(
+                      "Foo",
+                      trailingTrivia: .space
+                    ),
+                    genericParameterClause: nil,
+                    inheritanceClause: nil,
+                    genericWhereClause: nil,
+                    members: MemberDeclBlockSyntax(
+                      leftBrace: .leftBraceToken(),
+                      members: MemberDeclListSyntax([]),
+                      rightBrace: .rightBraceToken()
+                    )
+                  )
+                )
+              ),
+              semicolon: nil,
+              errorTokens: nil
+            )
+          ]),
+          eofToken: .eof()
+        )
+      ),
+      substructureCheckTrivia: true
     )
   }
-
 }