Fix remapping default to identifier and add test

Author: ibrahimoktay

Sources/SwiftParser/Names.swift

@@ -31,7 +31,7 @@ extension Parser {
         self.missingToken(.identifier, text: nil)
       )
     } else {
-      return (nil, self.consumeAnyToken())
+      return (nil, self.consumeAnyToken(remapping: .identifier))
     }
   }
 }

Tests/SwiftParserTest/StatementTests.swift

@@ -494,4 +494,30 @@ final class StatementTests: XCTestCase {
   func testDefaultIdentIdentifierInReturnStmt() {
     AssertParse("return FileManager.default")
   }
+  
+  func testDefaultAsIdentifierInSubscript() {
+    AssertParse(
+         """
+         data[position, default: 0]
+         """,
+         substructure: Syntax(ExprSyntax(SubscriptExprSyntax(
+          calledExpression: ExprSyntax(IdentifierExprSyntax(identifier: .identifier("data"), declNameArguments: nil)),
+          leftBracket: .leftSquareBracketToken(),
+          argumentList: TupleExprElementListSyntax([
+            TupleExprElementSyntax(
+              label: nil,
+              colon: nil,
+              expression: ExprSyntax(IdentifierExprSyntax(identifier: .identifier("position"), declNameArguments: nil)),
+              trailingComma: .commaToken()),
+            TupleExprElementSyntax(
+              label: .identifier("default"),
+              colon: .colonToken(),
+              expression: ExprSyntax(IntegerLiteralExprSyntax(0)),
+              trailingComma: nil),
+          ]),
+          rightBracket: .rightSquareBracketToken(),
+          trailingClosure: nil,
+          additionalTrailingClosures: nil)))
+    )
+  }
 }