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Associated types in traits used as bounds are treated as type arguments #18173

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rpjohnst opened this issue Oct 20, 2014 · 2 comments · Fixed by #25476
Closed

Associated types in traits used as bounds are treated as type arguments #18173

rpjohnst opened this issue Oct 20, 2014 · 2 comments · Fixed by #25476
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A-type-system Area: Type system E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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@rpjohnst
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When using a trait with an associated type as a bound on a type argument, its associated types are treated as arguments rather than as determined by the impl:

trait Foo {
    type T;
}

trait Bar<F: Foo> {
    fn bar(foo: &F);
}
error: wrong number of type arguments: expected 1, found 0

http://is.gd/KPP4ka
@ftxqxd
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ftxqxd commented Oct 20, 2014

Seems related to or maybe a dup of #17696.

@steveklabnik steveklabnik added the A-type-system Area: Type system label Jan 27, 2015
@ftxqxd
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ftxqxd commented May 15, 2015

Looks like this compiles now. Can this be closed?

@alexcrichton alexcrichton added the E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. label May 16, 2015
@rpjohnst rpjohnst mentioned this issue May 16, 2015
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Manishearth added a commit to Manishearth/rust that referenced this issue May 17, 2015
@Manishearth
Rollup merge of rust-lang#25476 - rpjohnst:master, r=huonw
bea1bba 
Closes rust-lang#18173
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A-type-system Area: Type system E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added.
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Test that associated types are not required as type parameters
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@steveklabnik @alexcrichton @rpjohnst @ftxqxd