[Issue 11886] New: "cannot access frame" error on lambda in lambda

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11886

           Summary: "cannot access frame" error on lambda in lambda
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: verylonglogin.reg at gmail.com


--- Comment #0 from Denis Shelomovskij <verylonglogin.reg at gmail.com> 2014-01-10 00:38:44 MSK ---
This code should compile:
---
struct S(alias fun)
{ void sf() { fun(1); } }

void f(alias fun)()
{ fun(); }

void g(alias fun)()
{ auto s = S!fun(); } // line 8

void main()
{
    int n;
    f!(() => g!(b => n)())(); // line 13
}
---
main.d(13): Error: delegate main.main.__lambda1.__lambda1 cannot access frame
of function D main
main.d(13): Error: pure nested function '__lambda1' cannot access mutable data
'n'
main.d(8):        instantiated from here: S!(__lambda1)
main.d(13):        instantiated from here: g!((b) => n)
---

It worked with previous dmd. As a result dmd rejects now such previously
working code:
---
import std.algorithm, std.array;

auto makeInoutArray(alias func, T)(inout T[] src)
{
    return cast(inout) func(cast(T[]) src).array();
}

void f(inout(int)[] iarr)
{
    int n;
    iarr.makeInoutArray!(arr => arr.map!(a => n)())();
}
---

Also dmd ICEs once while reducing this code to minimal testcase.

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