[Issue 3766] New: Pointers to pure, nothrow functions be subtypes of regular functions

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3766

           Summary: Pointers to pure, nothrow functions be subtypes of
                    regular functions
           Product: D
           Version: 2.040
          Platform: Other
        OS/Version: Windows
            Status: NEW
          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> 2010-02-03 13:56:10 PST ---
void nothrowStuff() nothrow {}
void pureStuff() pure {}
void stuff() {}

auto funcPtr = (0 == 0) ? &stuff : &nothrowStuff;
auto funcPtr2 = (0 == 0) ? &stuff : &pureStuff;

test.d(5): Error: incompatible types for ((& stuff) ? (& nothrowStuff)): 'void
function()' and 'void function() nothrow'
test.d(6): Error: incompatible types for ((& stuff) ? (& pureStuff)): 'void
function()' and 'void function() pure'

void function() pure and void function() nothrow should be considered subtypes
of void function().  A void function() pure or a void function() nothrow simply
provides an extra guarantee not present for void function() and thus can be
substituted in any context for a void function().

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