[Issue 7725] Implicit function pointer cast

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7725


Andrej Mitrovic <andrej.mitrovich at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |andrej.mitrovich at gmail.com


--- Comment #2 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2013-10-10 06:51:09 PDT ---
Another test-case copied from
http://d.puremagic.com/issues/show_bug.cgi?id=11207#c0:

(In reply to comment #0)
> class A {}
> class B : A {}
> B foo(const A) { return null; }
> void main() {
>     A function(const A)     f1 = &foo;  // compiles
>     B function(A)           f2 = &foo;  // does not compile
>     B function(immutable A) f3 = &foo;  // does not compile
>     B function(B)           f4 = &foo;  // does not compile
> }
> 
> test.d(6): Error: cannot implicitly convert expression (& foo) of type B
> function(const(A) _param_0) to B function(A)
> test.d(7): Error: cannot implicitly convert expression (& foo) of type B
> function(const(A) _param_0) to B function(immutable(A))
> test.d(8): Error: cannot implicitly convert expression (& foo) of type B
> function(const(A) _param_0) to B function(B)
> 
> 
> These implicit conversions should be possible. Explicit casting is too
> confusing and dangerous. If you make a mistake, you will end up with serious
> runtime errors.

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