On 3/29/22 04:05, Jakub Jelinek wrote:
Hi!
The concepts support (in particular template introductions from concepts TS)
broke the following testcase, valid unnamed bitfields with dependent
types (or even just typedefs) were diagnosed as typos (: instead of correct
::) in template introduction during their tentative parsing.
The following patch fixes that by not doing this : to :: correction when
member_p is true.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk and
release branches (so far also bootstrapped/regtested on the above targets
on 11 branch)?
OK.
2022-03-29 Jakub Jelinek <ja...@redhat.com>
PR c++/105061
* parser.cc (cp_parser_template_introduction): If member_p, temporarily
clear parser->colon_corrects_to_scope_p around tentative parsing of
nested name specifier.
* g++.dg/concepts/pr105061.C: New test.
--- gcc/cp/parser.cc.jj 2022-03-26 08:11:50.030217910 +0100
+++ gcc/cp/parser.cc 2022-03-28 17:30:41.488053848 +0200
@@ -31417,9 +31417,15 @@ cp_parser_template_introduction (cp_pars
tree saved_scope = parser->scope;
tree saved_object_scope = parser->object_scope;
tree saved_qualifying_scope = parser->qualifying_scope;
+ bool saved_colon_corrects_to_scope_p = parser->colon_corrects_to_scope_p;
cp_token *start_token = cp_lexer_peek_token (parser->lexer);
+ /* In classes don't parse valid unnamed bitfields as invalid
+ template introductions. */
+ if (member_p)
+ parser->colon_corrects_to_scope_p = false;
+
/* Look for the optional `::' operator. */
cp_parser_global_scope_opt (parser,
/*current_scope_valid_p=*/false);
@@ -31440,6 +31446,7 @@ cp_parser_template_introduction (cp_pars
parser->scope = saved_scope;
parser->object_scope = saved_object_scope;
parser->qualifying_scope = saved_qualifying_scope;
+ parser->colon_corrects_to_scope_p = saved_colon_corrects_to_scope_p;
if (concept_name == error_mark_node
|| (seen_error () && !concept_definition_p (tmpl_decl)))
--- gcc/testsuite/g++.dg/concepts/pr105061.C.jj 2022-03-28 17:34:02.051207207
+0200
+++ gcc/testsuite/g++.dg/concepts/pr105061.C 2022-03-28 17:33:14.502882074
+0200
@@ -0,0 +1,13 @@
+// PR c++/105061
+
+template <typename T, int U, int V>
+struct A { T : V, u : U; };
+template <int U, int V>
+struct B { unsigned : V, u : U; };
+typedef unsigned uns;
+template <int U, int V>
+struct C { uns : V, u : U; };
+
+A<unsigned int, 4, 5> a = { 13 };
+B<5, 6> b = { 26 };
+C<8, 9> c = { 42 };
Jakub
