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------------------------------------------------------------------------
On 2014-08-15T10:00:28+00:00 Doko-v wrote:

works on the trunk, fails on the 4.8 and 4.9 branches:

$ cat test.cc 
template <typename T> struct S {
  T i{[this] {}};
};

S<int> s;

$ /usr/lib/gcc-snapshot/bin/g++ -std=c++11 -c test.cc
test.cc:5:8: error: cannot convert '<brace-enclosed initializer list>' to 'int' in initialization
 S<int> s;
        ^
test.cc: In constructor 'constexpr S<int>::S()':
test.cc:1:30: error: cannot convert '<brace-enclosed initializer list>' to 'int' in initialization
 template <typename T> struct S {
                              ^
test.cc: At global scope:
test.cc:5:8: note: synthesized method 'constexpr S<int>::S()' first required here 
 S<int> s;
        ^

$ g++ -std=c++11 -c test.cc 
test.cc: In instantiation of 'struct S<int>::<lambda()>':
test.cc:1:30:   required from here
test.cc:2:8: internal compiler error: in tsubst_copy, at cp/pt.c:12544
   T i{[this] {}};
        ^
Please submit a full bug report,
with preprocessed source if appropriate.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/gcc-4.8/+bug/1338254/comments/3


** Changed in: gcc
       Status: Unknown => New

** Changed in: gcc
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/1338254

Title:
  internal error on lambda as argument

Status in The GNU Compiler Collection:
  New
Status in “gcc-4.8” package in Ubuntu:
  Confirmed
Status in “gcc-4.9” package in Ubuntu:
  Confirmed
Status in “gcc-snapshot” package in Ubuntu:
  Fix Released

Bug description:
  1) The release of Ubuntu I am using:

  $ lsb_release -rd
  Description:	Ubuntu 14.04 LTS
  Release:	14.04

  2) The package version:

  $ apt-cache policy g++
  g++:
    Installed: 4:4.8.2-1ubuntu6
    Candidate: 4:4.8.2-1ubuntu6
    Version table:
   *** 4:4.8.2-1ubuntu6 0
          500 http://ch.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  
  3) What I expected to happen:

  I expected the source file "test.cc" to compile correctly, using the
  compiler command:

  g++ -std=c++1y test.cc

  4) What happened instead:

  Compiler output:

  test.cc: In instantiation of ‘struct S<int>::__lambda0’:
  test.cc:15:8:   required from here
  test.cc:18:8: internal compiler error: in tsubst_copy, at cp/pt.c:12125
     B b{[this]() { foo(); }};
          ^
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-4.8/README.Bugs> for instructions.
  Preprocessed source stored into /tmp/ccgECJVP.out file, please attach this to your bugreport.

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