Parse #fileID

Author: DougGregor

Sources/SwiftParser/Expressions.swift

@@ -721,6 +721,9 @@ extension Parser {
     case .__file__Keyword:
       let tok = self.eat(.__file__Keyword)
       return RawExprSyntax(RawPoundFileExprSyntax(poundFile: tok, arena: self.arena))
+    case .poundFileIDKeyword:
+      let tok = self.eat(.poundFileIDKeyword)
+      return RawExprSyntax(RawPoundFileIDExprSyntax(poundFileID: tok, arena: self.arena))
     case .poundFileKeyword:
       let tok = self.eat(.poundFileKeyword)
       return RawExprSyntax(RawPoundFileExprSyntax(poundFile: tok, arena: self.arena))

Tests/SwiftParserTest/Expressions.swift

@@ -86,6 +86,7 @@ final class ExpressionTests: XCTestCase {
     AssertParse(
       """
       #file
+      #fileID
       (#line)
       #column
       #function