[Issue 18037] Lambda with specified template type parameter does not work with IFTI

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18037

Steven Schveighoffer <schveiguy at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |schveiguy at yahoo.com
           Hardware|x86                         |All
            Summary|template lambda cannot      |Lambda with specified
                   |deduce function from        |template type parameter
                   |argument types              |does not work with IFTI
                 OS|Mac OS X                    |All

--- Comment #1 from Steven Schveighoffer <schveiguy at yahoo.com> ---
Tested back to 2.070.0, which is where short lambda syntax was introduced.
Still fails.

The immutable looks odd, but even with alias this doesn't work.

alias lambda(T) = (T n) => n * n;

should expand to:

template lambda(T)
{
    alias lambda = (T n) => n * n;
}

Neither of these successfully use IFTI.

However, these all work:

alias lambda = (int n) => n * n;
alias lambda = n => n * n;

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