Fix up beginless ranges in method definitions

src/prism.c

@@ -11452,10 +11452,7 @@ parser_lex(pm_parser_t *parser) {
                     if (match(parser, '.')) {
                         if (match(parser, '.')) {
                             // If we're _not_ inside a range within default parameters
-                            if (
-                                !context_p(parser, PM_CONTEXT_DEFAULT_PARAMS) &&
-                                context_p(parser, PM_CONTEXT_DEF_PARAMS)
-                            ) {
+                            if (!context_p(parser, PM_CONTEXT_DEFAULT_PARAMS) && context_p(parser, PM_CONTEXT_DEF_PARAMS)) {
                                 if (lex_state_p(parser, PM_LEX_STATE_END)) {
                                     lex_state_set(parser, PM_LEX_STATE_BEG);
                                 } else {
@@ -14572,9 +14569,10 @@ parse_parameters(
                 bool repeated = pm_parser_parameter_name_check(parser, &name);
                 pm_parser_local_add_token(parser, &name, 1);
 
-                if (accept1(parser, PM_TOKEN_EQUAL)) {
-                    pm_token_t operator = parser->previous;
+                if (match1(parser, PM_TOKEN_EQUAL)) {
+                    pm_token_t operator = parser->current;
                     context_push(parser, PM_CONTEXT_DEFAULT_PARAMS);
+                    parser_lex(parser);
 
                     pm_constant_id_t name_id = pm_parser_constant_id_token(parser, &name);
                     uint32_t reads = parser->version == PM_OPTIONS_VERSION_CRUBY_3_3 ? pm_locals_reads(&parser->current_scope->locals, name_id) : 0;
@@ -14625,6 +14623,8 @@ parse_parameters(
             case PM_TOKEN_LABEL: {
                 if (!uses_parentheses) parser->in_keyword_arg = true;
                 update_parameter_state(parser, &parser->current, &order);
+
+                context_push(parser, PM_CONTEXT_DEFAULT_PARAMS);
                 parser_lex(parser);
 
                 pm_token_t name = parser->previous;
@@ -14644,15 +14644,20 @@ parse_parameters(
                     case PM_TOKEN_COMMA:
                     case PM_TOKEN_PARENTHESIS_RIGHT:
                     case PM_TOKEN_PIPE: {
+                        context_pop(parser);
+
                         pm_node_t *param = (pm_node_t *) pm_required_keyword_parameter_node_create(parser, &name);
                         if (repeated) {
                             pm_node_flag_set_repeated_parameter(param);
                         }
+
                         pm_parameters_node_keywords_append(params, param);
                         break;
                     }
                     case PM_TOKEN_SEMICOLON:
                     case PM_TOKEN_NEWLINE: {
+                        context_pop(parser);
+
                         if (uses_parentheses) {
                             looping = false;
                             break;
@@ -14662,15 +14667,14 @@ parse_parameters(
                         if (repeated) {
                             pm_node_flag_set_repeated_parameter(param);
                         }
+
                         pm_parameters_node_keywords_append(params, param);
                         break;
                     }
                     default: {
                         pm_node_t *param;
 
                         if (token_begins_expression_p(parser->current.type)) {
-                            context_push(parser, PM_CONTEXT_DEFAULT_PARAMS);
-
                             pm_constant_id_t name_id = pm_parser_constant_id_token(parser, &local);
                             uint32_t reads = parser->version == PM_OPTIONS_VERSION_CRUBY_3_3 ? pm_locals_reads(&parser->current_scope->locals, name_id) : 0;
 
@@ -14682,7 +14686,6 @@ parse_parameters(
                                 PM_PARSER_ERR_TOKEN_FORMAT_CONTENT(parser, local, PM_ERR_PARAMETER_CIRCULAR);
                             }
 
-                            context_pop(parser);
                             param = (pm_node_t *) pm_optional_keyword_parameter_node_create(parser, &name, value);
                         }
                         else {
@@ -14692,6 +14695,8 @@ parse_parameters(
                         if (repeated) {
                             pm_node_flag_set_repeated_parameter(param);
                         }
+
+                        context_pop(parser);
                         pm_parameters_node_keywords_append(params, param);
 
                         // If parsing the value of the parameter resulted in error recovery,
@@ -19247,6 +19252,7 @@ parse_expression_prefix(pm_parser_t *parser, pm_binding_power_t binding_power, b
                     lex_state_set(parser, PM_LEX_STATE_BEG);
                     parser->command_start = true;
 
+                    context_pop(parser);
                     if (!accept1(parser, PM_TOKEN_PARENTHESIS_RIGHT)) {
                         PM_PARSER_ERR_TOKEN_FORMAT(parser, parser->current, PM_ERR_DEF_PARAMS_TERM_PAREN, pm_token_type_human(parser->current.type));
                         parser->previous.start = parser->previous.end;
@@ -19266,17 +19272,20 @@ parse_expression_prefix(pm_parser_t *parser, pm_binding_power_t binding_power, b
                     lparen = not_provided(parser);
                     rparen = not_provided(parser);
                     params = parse_parameters(parser, PM_BINDING_POWER_DEFINED, false, false, true, true, (uint16_t) (depth + 1));
+
+                    context_pop(parser);
                     break;
                 }
                 default: {
                     lparen = not_provided(parser);
                     rparen = not_provided(parser);
                     params = NULL;
+
+                    context_pop(parser);
                     break;
                 }
             }
 
-            context_pop(parser);
             pm_node_t *statements = NULL;
             pm_token_t equal;
             pm_token_t end_keyword;

test/prism/fixtures/range_beginless.txt

@@ -0,0 +1,5 @@
+def f(x = ...?a); end
+
+def f(x: ...?a); end
+
+def f() ...:a; end