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from c6a562de88c c: After issuing errors about array size, for error-recover [...] new 75defde9fb5 c++: Replay errors during diagnosis of constraint satisfact [...] new cd68edf894d c++: Respect current_constraint_diagnosis_depth in diagnose [...] new a7ea3d2ced7 c++: requires-expression outside of a template is misevalua [...] new 7981c06ae92 c++: Diagnose when "requires" is used instead of "requires [...]

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Summary of changes: gcc/c-family/ChangeLog | 4 + gcc/c-family/c.opt | 4 + gcc/cp/ChangeLog | 52 +++++++ gcc/cp/constraint.cc | 188 ++++++++++++++++++----- gcc/cp/cp-gimplify.c | 7 + gcc/cp/cp-tree.h | 1 + gcc/cp/parser.c | 31 +++- gcc/cp/pt.c | 2 - gcc/cp/semantics.c | 6 +- gcc/testsuite/ChangeLog | 20 +++ gcc/testsuite/g++.dg/concepts/diagnostic1.C | 1 + gcc/testsuite/g++.dg/concepts/diagnostic2.C | 2 +- gcc/testsuite/g++.dg/concepts/diagnostic5.C | 43 ++++++ gcc/testsuite/g++.dg/concepts/diagnostic7.C | 11 ++ gcc/testsuite/g++.dg/concepts/diagnostic8.C | 6 + gcc/testsuite/g++.dg/concepts/pr94252.C | 27 ++++ gcc/testsuite/g++.dg/cpp2a/concepts-iconv1.C | 1 + gcc/testsuite/g++.dg/cpp2a/concepts-requires18.C | 2 +- gcc/testsuite/g++.dg/cpp2a/concepts-requires5.C | 2 +- 19 files changed, 366 insertions(+), 44 deletions(-) create mode 100644 gcc/testsuite/g++.dg/concepts/diagnostic5.C create mode 100644 gcc/testsuite/g++.dg/concepts/diagnostic7.C create mode 100644 gcc/testsuite/g++.dg/concepts/diagnostic8.C create mode 100644 gcc/testsuite/g++.dg/concepts/pr94252.C