Disallow old style generic constraint parsing

src/frontend/parsing/parser.nim

@@ -1054,7 +1054,7 @@ proc funDecl(self: Parser, isOperator: bool = false): FunDecl =
     if self.match("*"):
         function.isPrivate = false
         self.checkDecl(function.isPrivate)
-    if self.check(["<", "["]):
+    if self.check("["):
         self.parseGenerics(function)
     if self.match(LeftParen):
         var parameter: tuple[name: IdentExpr, valueType: Expression]
@@ -1215,7 +1215,7 @@ proc typeDecl(self: Parser): TypeDecl =
     result = newTypeDecl(name, newOrderedTable[string, TypeField](), true, token, @[], false, false)
     result.file = self.file
     result.isPrivate = not self.match("*")
-    if self.check(["<", "["]):
+    if self.check("["):
         self.parseGenerics(result)
     self.checkDecl(result.isPrivate)
     self.expect("=", "expecting '=' after type name")