https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94190
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:75b7b7fdc4597170f24c069ea13aa3e14f37fde7 commit r10-7362-g75b7b7fdc4597170f24c069ea13aa3e14f37fde7 Author: Marek Polacek <pola...@redhat.com> Date: Mon Mar 16 10:17:11 2020 -0400 c++: Fix wrong no post-decrement operator error in template [PR94190] Now that convert_like creates an IMPLICIT_CONV_EXPR when it converts something that involves a class in a template, we must be prepared to handle it. In this test, we have a class S and we're converting it to long int& using a user-defined conversion since we're performing -- on it. So cp_build_unary_op/POSTDECREMENT_EXPR calls build_expr_type_conversion which gets the IMPLICIT_CONV_EXPR. Before the convert_like change it got *S::operator long int &(&b) whose type is long int but now it gets IMPLICIT_CONV_EXPR<long int&>(b) whose type is a reference type. But the !MAYBE_CLASS_TYPE_P switch doesn't handle reference types and so we complain. Fixed by calling convert_from_reference on the result of convert_like. PR c++/94190 - wrong no post-decrement operator error in template. * call.c (convert_like_real): Use convert_from_reference on the result. * g++.dg/conversion/op7.C: New test.
