1943 – Templates can't take function pointer parameters

dmd 2.012, Linux
dmd rejects code which the spec says should be valid (the spec doesn't mention any limitations to value parameters):
BEGIN CODE
 template foo(void function() fp /*TPL...*/) {}
 void bar() {}
 alias foo!(&bar) a1;
END CODE
BEGIN dmd OUTPUT
 test.d(1): Error: arithmetic/string type expected for value-parameter, not void function()
END OUTPUT
BEGIN CODE (2nd manifestation)
 template foo(TPL...) {}
 void bar() {}
 alias foo!(&bar) a1;
END CODE
BEGIN dmd OUTPUT
 test.d(3): Error: expression & bar is not a valid template value argument
 test.d(3): template instance test.foo!(& bar) error instantiating
END OUTPUT

This has just cropped up on IRC. Either the compiler should be fixed to match the spec, or the spec should be changed to match the compiler's behaviour.
The simplest thing to do would be to change to spec to indicate that only strings, ints and floats are allowed as value parameters.

Commit pushed to https://github.com/D-Programming-Language/d-programming-language.org
https://github.com/D-Programming-Language/d-programming-language.org/commit/5b1b3d5e5b9947fe8e9472d89250f6c12c2e9cf5
fix Issue 1943 - Templates can't take function pointer parameters