[Issue 7751] New: [ICE] From auto and forward reference

[d-bugmail]

http://d.puremagic.com/issues/show_bug.cgi?id=7751

           Summary: [ICE] From auto and forward reference
           Product: D
           Version: unspecified
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nob...@puremagic.com
        ReportedBy: bearophile_h...@eml.cc


--- Comment #0 from bearophile_h...@eml.cc 2012-03-22 05:17:25 PDT ---
This is wrong D2 code because Foo has no constructor:


class Foo(T) {
    T x;
    Foo y;
}
auto foo(T)(T x, Foo!T y=null) {
    return new Foo!T(x, y);
}
void bar(U)(U foo, U[] spam=[]) {
    spam ~= [];
}
void main() {
    bar(foo(0));
}



DMD 2.059head gives:

test.d(6): Error: no constructor for Foo
test.d(12): Error: template instance test.foo!(int) error instantiating

Followed by a crash.



If I remove the template of Foo:


class Foo {
    int x;
    Foo y;
}
auto foo(int x, Foo y=null) {
    return new Foo(x, y);
}
void bar(U)(U foo, U[] spam=[]) {
    spam ~= [];
}
void main() {
    bar(foo(0));
}



DMD gives this and no crash:

test.d(6): Error: no constructor for Foo
test.d(12): Error: forward reference to foo

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