http://d.puremagic.com/issues/show_bug.cgi?id=10416

           Summary: Wrong error messages for inherited @safe class method
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: minor
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2013-06-19 10:46:41 PDT ---
import std.stdio: writeln;
abstract class Foo {
    void spam() @safe;
}
class Bar : Foo {
    override void spam() {
        writeln;
    }
}
void main() {}



DMD 2.063.2 gives the error message:

temp.d(7): Error: safe function 'bug2.Bar.spam' cannot call system function
'std.stdio.writeln!().writeln'

Even assuming that it's correct to label writeln() as a system function,
Bar.foo is not labeled @safe. So I think the correct error message is similar
to (note the use of system and @safe words below):


test.d(6): Error: system function bug2.Bar.spam does not override any function, did you mean to override @safe function 'bug2.Foo.spam'?

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--- Comment #1 from Kenji Hara <k.hara.pg@gmail.com> 2013-06-19 11:25:57 PDT ---
(In reply to comment #0)
> import std.stdio: writeln;
> abstract class Foo {
>     void spam() @safe;
> }
> class Bar : Foo {
>     override void spam() {
>         writeln;
>     }
> }
> void main() {}
> 
> 
> 
> DMD 2.063.2 gives the error message:
> 
> temp.d(7): Error: safe function 'bug2.Bar.spam' cannot call system function
> 'std.stdio.writeln!().writeln'
> 
> Even assuming that it's correct to label writeln() as a system function,
> Bar.foo is not labeled @safe. So I think the correct error message is similar
> to (note the use of system and @safe words below):
> 
> 
> test.d(6): Error: system function bug2.Bar.spam does not override any function, did you mean to override @safe function 'bug2.Foo.spam'?


This is correct error message. Bar.spam is implicitly inherits @safe attriubte from Foo.spam.

http://dlang.org/function#function-inheritance

Then Bar.spam is implicitly annotated with @safe, and system function call will become invalid.

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bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #2 from bearophile_hugs@eml.cc 2013-06-19 12:18:50 PDT ---
Thank you Kenji, my mistake.

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