[LLVMbugs] [Bug 19748] New: Parse error after a cast of a variable with the same name as an existing struct in a ternary operator

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19748

            Bug ID: 19748
           Summary: Parse error after a cast of a variable with the same
                    name as an existing struct in a ternary operator
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: vz-llvm at zeitlins.org
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Consider this:

% cat clang_tm.cpp
struct tm { };

int main()
{
    int tm = 1;
    const int nothing = 0;
    return tm ? (const int)tm : nothing;
}
% clang++ -c -Wall clang_tm.cpp
clang_tm.cpp:7:31: error: unexpected ':' in nested name specifier; did you mean
'::'?
    return tm ? (const int)tm : nothing;
                              ^
                              ::
clang_tm.cpp:7:28: error: no member named 'nothing' in 'tm'; did you mean
simply 'nothing'?
    return tm ? (const int)tm : nothing;
                           ^~~~~~~~~~~~
                           nothing
clang_tm.cpp:6:15: note: 'nothing' declared here
    const int nothing = 0;
              ^
clang_tm.cpp:7:40: error: expected ':'
    return tm ? (const int)tm : nothing;
                                       ^
                                       :
clang_tm.cpp:7:15: note: to match this '?'
    return tm ? (const int)tm : nothing;
              ^
clang_tm.cpp:7:40: error: expected expression
    return tm ? (const int)tm : nothing;
                                       ^
4 errors generated.

This is with:

% clang -v|&fgrep -v 'Found candidate'
Debian clang version 3.4-2 (tags/RELEASE_34/final) (based on LLVM 3.4)
Target: x86_64-pc-linux-gnu
Thread model: posix
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8

Removing the cast works around the bug (or at least what looks like a bug to
me), but this wasn't immediately clear when the error happened in the real code
which happened to include <time.h> and then use a local variable called "tm".

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