[ruby/prism] Better error message on statement inside argument list

ruby/prism@3b1a99526a

Author: kddnewton

prism/prism.c

@@ -14335,9 +14335,14 @@ parse_arguments_list(pm_parser_t *parser, pm_arguments_t *arguments, bool accept
         } else {
             pm_accepts_block_stack_push(parser, true);
             parse_arguments(parser, arguments, true, PM_TOKEN_PARENTHESIS_RIGHT);
-            expect1(parser, PM_TOKEN_PARENTHESIS_RIGHT, PM_ERR_ARGUMENT_TERM_PAREN);
-            pm_accepts_block_stack_pop(parser);
 
+            if (!accept1(parser, PM_TOKEN_PARENTHESIS_RIGHT)) {
+                PM_PARSER_ERR_TOKEN_FORMAT(parser, parser->current, PM_ERR_ARGUMENT_TERM_PAREN, pm_token_type_human(parser->current.type));
+                parser->previous.start = parser->previous.end;
+                parser->previous.type = PM_TOKEN_MISSING;
+            }
+
+            pm_accepts_block_stack_pop(parser);
             arguments->closing_loc = PM_LOCATION_TOKEN_VALUE(&parser->previous);
         }
     } else if (accepts_command_call && (token_begins_expression_p(parser->current.type) || match3(parser, PM_TOKEN_USTAR, PM_TOKEN_USTAR_STAR, PM_TOKEN_UAMPERSAND)) && !match1(parser, PM_TOKEN_BRACE_LEFT)) {

prism/templates/src/diagnostic.c.erb

@@ -105,7 +105,7 @@ static const pm_diagnostic_data_t diagnostic_messages[PM_DIAGNOSTIC_ID_MAX] = {
     [PM_ERR_ARGUMENT_NO_FORWARDING_STAR_STAR]   = { "unexpected `**`; no anonymous keyword rest parameter", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_ARGUMENT_SPLAT_AFTER_ASSOC_SPLAT]   = { "unexpected `*` splat argument after a `**` keyword splat argument", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_ARGUMENT_SPLAT_AFTER_SPLAT]         = { "unexpected `*` splat argument after a `*` splat argument", PM_ERROR_LEVEL_SYNTAX },
-    [PM_ERR_ARGUMENT_TERM_PAREN]                = { "expected a `)` to close the arguments", PM_ERROR_LEVEL_SYNTAX },
+    [PM_ERR_ARGUMENT_TERM_PAREN]                = { "unexpected %s; expected a `)` to close the arguments", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_ARGUMENT_UNEXPECTED_BLOCK]          = { "unexpected `{` after a method call without parenthesis", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_ARRAY_ELEMENT]                      = { "expected an element for the array", PM_ERROR_LEVEL_SYNTAX },
     [PM_ERR_ARRAY_EXPRESSION]                   = { "expected an expression for the array element", PM_ERROR_LEVEL_SYNTAX },

prism/templates/src/token_type.c.erb

@@ -208,7 +208,7 @@ pm_token_type_human(pm_token_type_t token_type) {
         case PM_TOKEN_KEYWORD_RESCUE:
             return "'rescue'";
         case PM_TOKEN_KEYWORD_RESCUE_MODIFIER:
-            return "'rescue'";
+            return "'rescue' modifier";
         case PM_TOKEN_KEYWORD_RETRY:
             return "'retry'";
         case PM_TOKEN_KEYWORD_RETURN:

test/prism/errors_test.rb

@@ -411,7 +411,7 @@ def test_arguments_after_block
 
     def test_arguments_binding_power_for_and
       assert_error_messages "foo(*bar and baz)", [
-        "expected a `)` to close the arguments",
+        "unexpected 'and'; expected a `)` to close the arguments",
         "unexpected ')', expecting end-of-input",
         "unexpected ')', ignoring it"
       ]