Summary: Another problem with pure inference of inner delegate
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD

--- Comment #0 from 2012-10-10 04:21:08 PDT ---
This is a spinoff of Issue 8751

alias bool delegate(in int) pure Dg;
Dg foo1(immutable Dg f) pure {
    return x => f(x); // OK
Dg foo2(const Dg f) pure {
    return x => f(x); // error
void main() {}

DMD2.060alpha gives:

temp.d(6): Error: cannot implicitly convert expression (__lambda4) of type bool
delegate(const(int) x) @system to bool delegate(const(int)) pure

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