https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123044
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Jason Merrill <[email protected]>: https://gcc.gnu.org/g:93c0642bb54ee3205db666a47a06f87d6c50eff2 commit r16-6275-g93c0642bb54ee3205db666a47a06f87d6c50eff2 Author: Egas Ribeiro <[email protected]> Date: Thu Dec 11 13:30:49 2025 +0000 c++: Fix ICE with functional cast to reference in template [PR123044] When processing a functional cast to a reference type in a template context, build_functional_cast_1 wasn't calling convert_from_reference. This left the expression with a reference type, which later triggered an assertion in implicit_conversion from r15-6709 that expects expression types to already be dereferenced. In contrast, cp_build_c_cast already calls convert_from_reference on the result in template contexts, so C-style casts like (R)x worked correctly. The fix makes functional casts consistent with C-style casts by calling convert_from_reference before returning in the template processing path. PR c++/123044 gcc/cp/ChangeLog: * typeck2.cc (build_functional_cast_1): Call convert_from_reference on template CAST_EXPR to match C-style cast behavior. gcc/testsuite/ChangeLog: * g++.dg/template/implicit-func-cast.C: New test. Signed-off-by: Egas Ribeiro <[email protected]> Reviewed-by: Jason Merrill <[email protected]>
