Disallow Self as struct names

Author: ahoppen

Sources/SwiftParser/Nominals.swift

@@ -150,7 +150,7 @@ extension Parser {
     introucerHandle: RecoveryConsumptionHandle
   ) -> T where T: NominalTypeDeclarationTrait {
     let (unexpectedBeforeIntroducerKeyword, introducerKeyword) = self.eat(introucerHandle)
-    let (unexpectedBeforeName, name) = self.expectIdentifier(keywordRecovery: true)
+    let (unexpectedBeforeName, name) = self.expectIdentifier(allowIdentifierLikeKeywords: false, keywordRecovery: true)
     if unexpectedBeforeName == nil && name.isMissing && self.currentToken.isAtStartOfLine {
       return T.init(
         attributes: attrs.attributes,

Tests/SwiftParserTest/translated/IdentifiersTests.swift

@@ -109,15 +109,22 @@ final class IdentifiersTests: XCTestCase {
   func testIdentifiers8b() {
     AssertParse(
       """
-      struct Self {}
+      struct 1️⃣Self {}
       """,
       diagnostics: [
-        // TODO: Old parser expected error on line 3: keyword 'Self' cannot be used as an identifier here
-        // TODO: Old parser expected note on line 3: if this name is unavoidable, use backticks to escape it, Fix-It replacements: 8 - 12 = '`Self`'
+        DiagnosticSpec(message: "keyword 'Self' cannot be used as an identifier here")
       ]
     )
   }
 
+  func testStructNamedAny() {
+    AssertParse(
+      """
+      struct any {}
+      """
+    )
+  }
+
   func testIdentifiers8c() {
     AssertParse(
       """