https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82247
Daniel Krügler <daniel.kruegler at googlemail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |daniel.kruegler@googlemail. | |com --- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> --- You need to provide the concrete compile conditions in the bug report. Using the compiler flags -Wall -Wextra -std=c++1z -pedantic "-fconcepts" I couldn't verify the the result, see https://wandbox.org/permlink/heubbLxMihDsJSBM