[Issue 12408] New: map does not like inout

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12408

           Summary: map does not like inout
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: lt.infiltrator at gmail.com


--- Comment #0 from Infiltrator <lt.infiltrator at gmail.com> 2014-03-18 18:20:59 PDT ---
http://dpaste.dzfl.pl/cd03223f4472

----------------------------------------------------
import std.algorithm : map;

class L {
   auto fun(const S s) inout nothrow pure @safe {
      if(point[0] is s)
         return point[1];
      else
         return point[0];
   }
   this(S a, S b) {
      point = [a, b];
   }
   S[2] point;
}

class S {
   @property auto foo() inout nothrow pure @safe {
      return arr.map!(e => e.fun(this));
   }
   L[] arr;
}

void main() { }
----------------------------------------------------
Fails to compile:
/opt/compilers/dmd2/include/std/algorithm.d(438): Error: variable
f922.S.foo.MapResult!(__lambda1, inout(L)[]).MapResult._input only parameters
or stack based variables can be inout
/opt/compilers/dmd2/include/std/algorithm.d(390): Error: template instance
f922.S.foo.MapResult!(__lambda1, inout(L)[]) error instantiating
/d556/f922.d(18): instantiated from here: map!(inout(L)[]) /d556/f922.d(18):
Error: template instance f922.S.foo.map!((e) => e.fun(this)).map!(inout(L)[])
error instantiating /d556/f922.d(18): Error: template std.algorithm.map cannot
deduce function from argument types !((e) => e.fun(this))(inout(L[])),
candidates are: /opt/compilers/dmd2/include/std/algorithm.d(375):
std.algorithm.map(fun...) if (fun.length >= 1)

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