[Issue 6373] New: More descriptive 'hidden by X is deprecated' error

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6373

           Summary: More descriptive 'hidden by X is deprecated' error
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: diagnostic
          Severity: minor
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2011-07-24 06:04:20 PDT ---
Wrong D2 code:


class Foo {
    void method(int x) {}
    void method(double x) {}
}
class Bar : public Foo { // line 5
    override void method(int x) {}
}
void main() {
    Foo f = new Bar();
    f.method(1);
    f.method(1.5);
}


DMD 2.054 gives the error:
test.d(5): Error: class test.Bar use of test.Foo.method(double x) hidden by Bar
is deprecated


While this program gives no errors:

class Foo {
    void method(int x) {}
    void method(double x) {}
}
class Bar : public Foo {
    alias Foo.method method;
    override void method(int x) {}
}
void main() {
    Foo f = new Bar();
    f.method(1);
    f.method(1.5);
}


In the error message I suggest to add some reference to this usage of alias,
because in D.learn I've seen some D programmers blocked by this error message.

A possible message (also note the error line number, 6 instead of 5):

test.d(6): Error: class test.Bar use of test.Foo.method(double x) hidden by Bar
is deprecated. Use alias Foo.method method; if intended.

Or even, to be more clear:

test.d(6): Error: class test.Bar use of test.Foo.method(double x) hidden (not
overridden) by Bar is deprecated. Use alias Foo.method method; if intended.

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