[Bug c++/92652] function call to lambda expression that return true does not satisfy the constraint in requires-clause if using return type deduction
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92652 Patrick Palka changed: What|Removed |Added Resolution|--- |FIXED Status|ASSIGNED|RESOLVED --- Comment #5 from Patrick Palka --- Fixed for GCC 10.2+.
[Bug c++/92652] function call to lambda expression that return true does not satisfy the constraint in requires-clause if using return type deduction
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92652 --- Comment #4 from CVS Commits --- The releases/gcc-10 branch has been updated by Patrick Palka : https://gcc.gnu.org/g:03c344ad180e094140be514a5e7cbaf95b5dcd2e commit r10-8214-g03c344ad180e094140be514a5e7cbaf95b5dcd2e Author: Patrick Palka Date: Fri May 29 14:17:02 2020 -0400 c++: lambdas inside constraints [PR92652] When parsing a constraint-expression, a requires-clause or a requires-expression, we temporarily increment processing_template_decl so that we always obtain template trees which we could later reduce via substitution even when not inside a template. But incrementing processing_template_decl when we're already inside a template has the unintended side effect of shifting up the template parameter levels of a lambda defined inside one of these constructs, which leads to confusion later during substitution into the lambda. This patch fixes this issue by incrementing processing_template_decl during parsing of these constructs only if it is 0. gcc/cp/ChangeLog: PR c++/92652 PR c++/93698 PR c++/94128 * parser.c (cp_parser_requires_clause_expression): Temporarily increment processing_template_decl only if it is 0. (cp_parser_constraint_expression): Likewise. (cp_parser_requires_expression): Likewise. gcc/testsuite/ChangeLog: PR c++/92652 PR c++/93698 PR c++/94128 * g++.dg/cpp2a/concepts-lambda8.C: New test. * g++.dg/cpp2a/concepts-lambda9.C: New test. * g++.dg/cpp2a/concepts-lambda10.C: New test. (cherry picked from commit 020d86db8896f088435830595640e6fc21bc64ad)
[Bug c++/92652] function call to lambda expression that return true does not satisfy the constraint in requires-clause if using return type deduction
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92652 --- Comment #3 from CVS Commits --- The master branch has been updated by Patrick Palka : https://gcc.gnu.org/g:020d86db8896f088435830595640e6fc21bc64ad commit r11-723-g020d86db8896f088435830595640e6fc21bc64ad Author: Patrick Palka Date: Fri May 29 09:40:40 2020 -0400 c++: lambdas inside constraints [PR92652] When parsing a constraint-expression, a requires-clause or a requires-expression, we temporarily increment processing_template_decl so that we always obtain template trees which we could later reduce via substitution even when not inside a template. But incrementing processing_template_decl when we're already inside a template has the unintended side effect of shifting up the template parameter levels of a lambda defined inside one of these constructs, which leads to confusion later during substitution into the lambda. This patch fixes this issue by incrementing processing_template_decl during parsing of these constructs only if it is 0. Passes 'make check-c++', and also tested by building cmcstl2, does this look OK to commit after a full bootstrap/regtest? gcc/cp/ChangeLog: PR c++/92652 PR c++/93698 PR c++/94128 * parser.c (cp_parser_requires_clause_expression): Temporarily increment processing_template_decl only if it is 0. (cp_parser_constraint_expression): Likewise. (cp_parser_requires_expression): Likewise. gcc/testsuite/ChangeLog: PR c++/92652 PR c++/93698 PR c++/94128 * g++.dg/cpp2a/concepts-lambda8.C: New test. * g++.dg/cpp2a/concepts-lambda9.C: New test. * g++.dg/cpp2a/concepts-lambda10.C: New test.
[Bug c++/92652] function call to lambda expression that return true does not satisfy the constraint in requires-clause if using return type deduction
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92652 Patrick Palka changed: What|Removed |Added CC||ppalka at gcc dot gnu.org Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org Status|NEW |ASSIGNED
[Bug c++/92652] function call to lambda expression that return true does not satisfy the constraint in requires-clause if using return type deduction
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92652 Martin Liška changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed||2020-01-30 CC||marxin at gcc dot gnu.org Ever confirmed|0 |1
[Bug c++/92652] function call to lambda expression that return true does not satisfy the constraint in requires-clause if using return type deduction
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92652 --- Comment #2 from Ryou Ezoe --- Yes. this is C++20 concepts .
[Bug c++/92652] function call to lambda expression that return true does not satisfy the constraint in requires-clause if using return type deduction
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92652 Eric Gallager changed: What|Removed |Added CC||egallager at gcc dot gnu.org Blocks||54367 --- Comment #1 from Eric Gallager --- is this a "concepts" thing? (I don't know C++ very well; I mostly just triage bugs, and the "requires" and "constraint" terms remind me of some "concepts" bugs...) Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54367 [Bug 54367] [meta-bug] lambda expressions
