[Issue 3797] Regression(2.038): Implicit conversion between incompatible function pointers

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3797



--- Comment #15 from yebblies <yebblies at gmail.com> 2011-06-06 20:01:10 PDT ---
The reason this happens is because TypeFunction does not override constConv. 
When called on TypeFunction, TypeNext::constConv is actually called, which only
compares the return type. (next in TypeFunction is the return type)

I've created a possible fix in dmd pull 88 which defines
TypeFunction::constConv to disallow most implicit conversions between function
pointers.

The current patch allows reasonable purity, safety and nothrow conversions.  If
you're interested, please take a look and see if all cases are covered.

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