Undescriptive linker error. (bug?)

[Adam D. Ruppe]

On Friday, 5 April 2019 at 21:59:35 UTC, Sjoerd Nijboer wrote:
> Foo Bar()
> {
> 	Foo foo();

It looks like the compiler is treating that as a function 
prototype without a body (that just happens to be nested in 
another function).

> 	return foo;

And then, this foo is given the optional parens treatment, as if 
it was a call to foo() of the given function, which is why the 
linker complains.

Weird combination of cases that maybe should be illegal.