https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86728
Bug ID: 86728
Summary: [Regression] unexpected error: conversion from
'<lambda(<type error>, ...)>' to non-scalar type
'std::function<void(int)>' requested
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: v.reshetnikov at gmail dot com
Target Milestone: ---
/******************* BEGIN SOURCE *******************/
#include <functional>
std::function<void(int)> a = [](int x ...) { }; // OK
std::function<void(int)> b = [](auto x, ...) { }; // OK
std::function<void(int)> c = [](auto x ...) { }; /* error: conversion from
'<lambda(<type error>, ...)>' to non-scalar type 'std::function<void(int)>'
requested */
/******************** END SOURCE ********************/
The error in the last line appears with build 9.0.0 20180728 (experimental),
8.2, 8.1. This code used to compile successfully with GCC versions 6.1 - 7.3.
For comparison, the latest versions of clang and MSVC compile this code
successfully as well.
