[LLVMbugs] [Bug 16090] New: templated constexpr function with return type deduction does not compile

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16090

            Bug ID: 16090
           Summary: templated constexpr function with return type
                    deduction does not compile
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jonathan.sauer at gmx.de
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following program does not compile with clang r181693:

constexpr auto foo() { return 0; }

template <typename T>
auto bar() { return 0; }

template <typename T>
constexpr auto baz() { return 0; }


This results in:

% clang++ -std=c++1y -v -c clang.cpp
clang version 3.4 (trunk 181693)
[...]
clang.cpp:7:16: error: constexpr function's return type 'auto' is not a literal
type
constexpr auto baz() { return 0; }
               ^
1 error generated.


- The non-templated constexpr variant "foo" compiles.
- The templated non-constexpr variant "bar" compiles, too.
- The templated constexpr variant "baz" does not compile, even though its body
is identical to the other two.

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