https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92556
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:1e166191ef330f3491d405bf3eb09b2b796c9b0e commit r10-6649-g1e166191ef330f3491d405bf3eb09b2b796c9b0e Author: Jason Merrill <ja...@redhat.com> Date: Sat Feb 15 14:48:08 2020 +0100 c++: Fix lambda in atomic constraint. find_template_parameters needs to find the mention of T in the lambda. Fixing that leaves this as a hard error, which may be surprising but is consistent with lambdas in other SFINAE contexts like template argument deduction. gcc/cp/ChangeLog 2020-02-15 Jason Merrill <ja...@redhat.com> PR c++/92556 * pt.c (any_template_parm_r): Look into lambda body.