[Issue 7120] New: Scope Delegates + Delegate Literals

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7120

           Summary: Scope Delegates + Delegate Literals
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: performance
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: dsimcha at yahoo.com


--- Comment #0 from David Simcha <dsimcha at yahoo.com> 2011-12-16 11:23:57 PST ---
The following code apparently heap-allocates a closure even though doNothing()
takes a scope delegate.  This happens when doNothing() is passed a delegate
literal.  When it's passed the address of a named inner function, no heap
allocation takes place.

import core.memory;

void main() {
    GC.disable();

    foreach(j; 0..1_000_000_000) {
        doIt();
    }
}

void doIt() {
    int i;
    doNothing(() { i++; });
}

void doNothing(scope void delegate() dg) {
    dg();
}

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