diff options
Diffstat (limited to 'gcc/cp/parser.c')
| -rw-r--r-- | gcc/cp/parser.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c index 4a2b2a9..d0adaa0 100644 --- a/gcc/cp/parser.c +++ b/gcc/cp/parser.c @@ -14967,6 +14967,7 @@ cp_parser_alias_declaration (cp_parser* parser) cp_declarator *declarator; cp_decl_specifier_seq decl_specs; bool member_p; + const char *saved_message = NULL; /* Look for the `using' keyword. */ cp_parser_require_keyword (parser, RID_USING, RT_USING); @@ -14975,7 +14976,35 @@ cp_parser_alias_declaration (cp_parser* parser) attributes = cp_parser_attributes_opt (parser); cp_parser_require (parser, CPP_EQ, RT_EQ); + /* Now we are going to parse the type-id of the declaration. */ + + /* + [dcl.type]/3 says: + + "A type-specifier-seq shall not define a class or enumeration + unless it appears in the type-id of an alias-declaration (7.1.3) that + is not the declaration of a template-declaration." + + In other words, if we currently are in an alias template, the + type-id should not define a type. + + So let's set parser->type_definition_forbidden_message in that + case; cp_parser_check_type_definition (called by + cp_parser_class_specifier) will then emit an error if a type is + defined in the type-id. */ + if (parser->num_template_parameter_lists) + { + saved_message = parser->type_definition_forbidden_message; + parser->type_definition_forbidden_message = + G_("types may not be defined in alias template declarations"); + } + type = cp_parser_type_id (parser); + + /* Restore the error message if need be. */ + if (parser->num_template_parameter_lists) + parser->type_definition_forbidden_message = saved_message; + cp_parser_require (parser, CPP_SEMICOLON, RT_SEMICOLON); if (cp_parser_error_occurred (parser)) |