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supertrait expansion needs normalization #23208

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nikomatsakis opened this issue Mar 9, 2015 · 4 comments
Closed

supertrait expansion needs normalization #23208

nikomatsakis opened this issue Mar 9, 2015 · 4 comments
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A-associated-items Area: Associated items (types, constants & functions) 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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@nikomatsakis
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This example doesn't compile:

trait TheTrait : TheSuperTrait<<Self as TheTrait>::Item> {
    type Item;
}

trait TheSuperTrait<T> {
    fn get(&self) -> T;
}

impl TheTrait for i32 {
    type Item = u32;
}

impl TheSuperTrait<u32> for i32 {
    fn get(&self) -> u32 {
        *self as u32
    }
}

fn foo<T:TheTrait<Item=u32>>(t: &T) -> u32 {
    t.get()
}

fn main() {
    foo::<i32>(&22);
}

This is because we fail to normalize during supertrait expansion.

@nikomatsakis nikomatsakis added A-associated-items Area: Associated items (types, constants & functions) I-wrong labels Mar 9, 2015
@huonw
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huonw commented Mar 9, 2015

Is the example missing the definition of TheTrait?

@nikomatsakis
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I suppose it is. That's kind of important isn't it :)

@nikomatsakis
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Updated the example.

@apasel422
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This appears to compile with rustc 1.4.0-nightly (d50352419 2015-08-29).

@sfackler sfackler added the E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. label Aug 29, 2015
bors added a commit that referenced this issue Sep 9, 2015
Dylan-DPC-zz referenced this issue in Dylan-DPC-zz/rust Mar 21, 2021
…chenkov

Move some tests to more reasonable directories - 5

cc rust-lang#73494

Threshold is 0.95. Next time I promise I will take a look into the special/misclassified directories.

- [issues/issue-23208.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-23208.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/23208)</sup>: associated-types 0.951
- [weird-exprs.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/weird-exprs.rs) <sup>unknown</sup>: destructuring-assignment 0.958
- [issues/issue-1701.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-1701.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/1701)</sup>: structs-enums 0.974
- [issues/issue-48508-aux.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-48508-aux.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/48508)</sup>: numbers-arithmetic 0.991
- [fn_must_use.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/fn_must_use.rs) <sup>unknown</sup>: lint 1.000
- [mir_check_nonconst.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/mir_check_nonconst.rs) <sup>unknown</sup>: consts 1.002
- [issues/issue-52060.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-52060.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/52060)</sup>: consts 1.017
- [issues/issue-45729-unsafe-in-generator.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-45729-unsafe-in-generator.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/45729)</sup>: generator 1.024
- [issues/issue-10392.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-10392.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/10392)</sup>: pattern 1.039
- [no-implicit-prelude.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/no-implicit-prelude.rs) <sup>unknown</sup>: resolve 1.071
- [issues/issue-68000-unicode-ident-after-missing-comma.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-68000-unicode-ident-after-missing-comma.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/68000)</sup>: parser 1.079
- [shadow.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/shadow.rs) <sup>unknown</sup>: binding 1.099
- [issues/issue-65611.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-65611.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/65611)</sup>: consts 1.139
- [concat-rpass.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/concat-rpass.rs) <sup>unknown</sup>: macros 1.194
- [issues/issue-31597.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-31597.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/31597)</sup>: associated-types 1.195
- [issues/issue-78372.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/issues/issue-78372.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/78372)</sup>: resolve 1.426
- [impl-trait-in-bindings-issue-73003.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/impl-trait-in-bindings-issue-73003.rs) <sup>[issue](https://github.com/rust-lang/rust/issues/73003)</sup>: impl-trait 1.471
- [impl-trait-in-bindings.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/impl-trait-in-bindings.rs) <sup>unknown</sup>: impl-trait 2.500

r? `@petrochenkov`
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