[Issue 8147] New: Blah!R.init now requires parens - (Blah!R).init

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8147

           Summary: Blah!R.init now requires parens - (Blah!R).init
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: jmdavisProg at gmx.com


--- Comment #0 from Jonathan M Davis <jmdavisProg at gmx.com> 2012-05-25 02:56:38 PDT ---
In 2.059, this compiles:

import std.algorithm;
import std.conv;

enum A { a, b, c }

void main()
{
    map!"to!string(a)"([A.a]);
}

But with the latest head, you get this error:

/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/algorithm.d(382): Error:
undefined identifier 'init'
q.d(8): Error: template instance std.algorithm.map!("to!string(a)").map!(A[])
error instantiating

The offending line is line# 382 of std.algorithm:

            alias typeof(_fun(.ElementType!R.init)) ElementType;

If you put parens around .ElementType!R, then it compiles, but without them, it
now fails. So, from the looks of it, the compiler now associates the .init with
R instead of the result of .ElementType!R.

If this was a purposeful change, then map needs to be changed. However, if it
was an accidental change (as I assume that it was), then dmd needs to be fixed.

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