[llvm-bugs] [Bug 28468] New: clang accepts illegal C++ code that uses expression as function

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28468

            Bug ID: 28468
           Summary: clang accepts illegal C++ code that uses expression as
                    function
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The current clang trunk (and all versions at least as early as 3.2) accepts the
following C++ code, which is illegal and rejected by the current GCC trunk. 

Interestingly, the code is also accepted by GCC 6.1 and before, and MSVC. 


$ clang++ -v
clang version 3.9.0 (trunk 274742)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.1.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clang++ -c small.cpp
$ 
$ g++-trunk -c small.cpp
small.cpp: In member function ‘void A< <template-parameter-1-1> >::foo()’:
small.cpp:7:9: error: expression cannot be used as a function
     i (0);
         ^
$ 
$ g++-6.1 -c small.cpp
$ 


-----------------------------------


template < class > struct A
{
  int i;

  void foo () 
  { 
    i (0);
  }
};

A < int > a;

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