https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83644
Bug ID: 83644
Summary: ICE using type alias from recursive decltype in
noexcept or return type
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gccbugbjorn at fahller dot se
Target Milestone: ---
Created attachment 42996
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42996&action=edit
Source of failing program
The program (attached, and on https://godbolt.org/g/N6nHKk) ICEs as follows:
bf@rahonavis /tmp> g++ -std=c++17 t.cpp
t.cpp: In instantiation of 'compose(F&&, Fs&& ...)::<lambda(auto:1&& ...)>
[with auto:1 = {int}; F = f()::<lambda(auto:2)>; Fs =
{f()::<lambda(auto:3)>}]':
t.cpp:32:72: required from here
t.cpp:20:39: internal compiler error: Segmentation fault
using tail_type = decltype(compose(std::forward<Fs>(fs)...));
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
To make it not fail, use the macro instead of the type alias, or comment out
both the trailing return type and the noexcept.
