[LLVMbugs] [Bug 20998] New: clang++ crashes when compiles the code with a generic lambda inside a parameter pack expansion

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20998

            Bug ID: 20998
           Summary: clang++ crashes when compiles the code with a generic
                    lambda inside a parameter pack expansion
           Product: clang
           Version: trunk
          Hardware: PC
                OS: other
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++1y
          Assignee: unassignedclangbugs at nondot.org
          Reporter: constructor7777 at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13052
  --> http://llvm.org/bugs/attachment.cgi?id=13052&action=edit
Source file which causes a crash

Command line output:

>F:\Programs\LLVM\bin\clang++ -std=c++14 -Wall -Wextra -pedantic-errors main.cpp
Assertion failed: isa<LabelDecl>(D) && "declaration not instantiated in this
scope", file
D:\src\llvm_release_build_3.5.0\llvm\tools\clang\lib\Sema\SemaTemplateInstantiate.cpp,
line 2703
clang++.exe: error: clang frontend command failed with exit code 3 (use -v to
see invocation)
clang version 3.5.0 (217039)
Target: i686-pc-windows-gnu
Thread model: posix
clang++.exe: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang++.exe: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++.exe: note: diagnostic msg:
C:\Users\vm\AppData\Local\Temp\main-66b1bd.cpp
clang++.exe: note: diagnostic msg:
C:\Users\vm\AppData\Local\Temp\main-66b1bd.sh
clang++.exe: note: diagnostic msg:

********************

Preprocessed source (main-66b1bd.cpp):

# 1 "<built-in>"
# 1 "main.cpp"
template
    <
        typename... Types
    >
void Foo
    (
        Types...
    )
{
}

template
    <
        typename... Functors
    >
void Bar
    (
        Functors... functors
    )
{
    Foo
        (
            [functors](auto... arguments)
            {
                return functors(arguments...);
            }...
        );
}

int main()
{
    Bar
        (
            [](){ return 1; },
            [](int){ return 2; }
        );
}

Assosiated run script (main-66b1bd.sh):

 "F:\Programs\LLVM\bin\clang++.exe" -cc1 -triple i686-pc-windows-gnu -emit-obj
-mrelax-all -disable-free -main-file-name main.cpp -mrelocation-model static
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -target-cpu
pentium4 -dwarf-column-info -Wall -Wextra -pedantic-errors -std=c++14
-fdeprecated-macro -ferror-limit 19 -fmessage-length 80 -mstackrealign
-fno-use-cxa-atexit -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -x c++ main-66b1bd.cpp

P.S. I'm using Clang 3.5.0 installed via a pre-built 'Clang for Windows'
installer (LLVM-3.5.0-win32.exe) on a machine with Windows 7 OS.

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