[LLVMbugs] [Bug 22759] New: (Brace-) Copy-Initialization of lambda-member variables of class-templates fails with “error?=:=?UTF-8?Q? excess elements in struct initializer”

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22759

            Bug ID: 22759
           Summary: (Brace-) Copy-Initialization of lambda-member
                    variables of class-templates fails with “error: excess
                    elements in struct initializer”
           Product: clang
           Version: 3.5
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: florian.weber at sfz-bw.de
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Compiling the following code fails with clang 3.5:

===========================

template<typename T>
struct my_class {
    my_class(T arg): t{arg} {}
    T t;
};

int main() {
    auto lambda = []{};
    my_class<decltype(lambda)>{lambda};
}

==========================
$ uname -a
Linux terra 3.14.32-1-lts #1 SMP Fri Feb 6 20:51:49 CET 2015 x86_64 GNU/Linux
$ clang++ --version
clang version 3.5.1 (tags/RELEASE_351/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ clang++ -std=c++11 test.cpp 
test.cpp:4:21: error: excess elements in struct initializer
        my_class(T arg): t{arg} {}
                           ^~~
test.cpp:10:2: note: in instantiation of member function 'my_class<(lambda at
test.cpp:9:16)>::my_class' requested here
        my_class<decltype(lambda)>{lambda};
        ^
1 error generated.

==========================

Since lambdas do have copy-constructors I am very positive that this code
should compile and gcc agrees with me here. Otherwise the error-message would
certainly need improvement.

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