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From: "omawarisan.bokudesu at live dot jp" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates
Date: Fri, 25 May 2012 14:09:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53484

             Bug #: 53484
           Summary: [c++11] Wrong auto in lambdas in function templates
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: omawarisan.bokudesu@live.jp


In the following program, auto is deduced to be int&, while int is expected.

template <class T>
void f(T x){
   [&]{
       std::cout << x << std::endl;
       auto y = x;
       y = 100;
       std::cout << x << std::endl;
   }();
}

int main(){ f(0); }

output:
0
100

In non-template functions, it doesn't occur.

------------
revision r187865

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/user/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/home/user/gcc-trunk
--disable-bootstrap --disable-multilib --enable-languages=c,c++,fortran
--with-gmp=/home/user/gcc-trunk/src/build/backends
--with-mpfr=/home/user/gcc-trunk/src/build/backends
--with-mpc=/home/user/gcc-trunk/src/build/backends
Thread model: posix
gcc version 4.8.0 20120525 (experimental) (GCC)