[LLVMbugs] [Bug 15656] New: not substituting into some instantiation-dependent (but not type-dependent) expressions inside sizeof

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15656

            Bug ID: 15656
           Summary: not substituting into some instantiation-dependent
                    (but not type-dependent) expressions inside sizeof
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

For instance:

template<typename T> void f(int a[sizeof(static_cast<int &>( T() ))]);
void g() { f<double[42]>(0); }

We should reject this (both the value-initialization and the cast are
ill-formed), but we apparently don't even instantiate inside the sizeof's
operand (perhaps because it's not type-dependent?).

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