[llvm-bugs] [Bug 27962] New: Cannot parse array subscript with comma/assignment

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27962

            Bug ID: 27962
           Summary: Cannot parse array subscript with comma/assignment
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hstong at ca.ibm.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Clang fails to attempt parsing a /statement/ as an /expression-statement/ when
it encounters a comma (or an assignment operator) in the potential array bound
in its attempt to parse the /statement/ as a /declaration-statement/.


### SOURCE:
void foo(int *x, unsigned idx) {
   int(x[0, idx]);
}


### INVOCATION:
clang++ -cc1 -fsyntax-only subscriptvex.cc


### ACTUAL OUTPUT:
subscriptvex.cc:2:11: error: expected ']'
   int(x[0, idx]);
          ^
subscriptvex.cc:2:9: note: to match this '['
   int(x[0, idx]);
        ^
subscriptvex.cc:2:8: error: redefinition of 'x' with a different type: 'int
([0]' vs 'int *'
   int(x[0, idx]);
       ^
subscriptvex.cc:1:15: note: previous definition is here
void foo(int *x, unsigned idx) {
              ^
2 errors generated.


### EXPECTED OUTPUT:
Clean compile.

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