Completion based on trait bounds

[kngwyu]

Related: #706, #829

General roadmap

• [x] for FnArg already implemented in #828, #937

  fn f<T: Clone>(a: T) {
  let b = a.clo~
  }

• [x] for struct member implemented in #948 , #975

  struct S<T> {
  mem: T
  }
  fn f<T: Clone>(a: S<T>) {
  let b = a.mem.clo~
  }
  impl<T: Clone> S<T> {
  fn f(self) {
      let b = a.mem.clo~
  } 
  }

• [ ] for closures

  fn fun<F: Fn() -> Option<i64>>(f: F) {
  let a = f().unwra~
  }

• [x] associated functions and types implemented in #991

Precise roadmaps

refactor generics support

• [x] Intoroduce ImplHeader #938
• [x] Replace MatchType::Impl and MatchType::TraitImpl with ImplHeader
• [x] Remove Match::generics_args and Match::generic_types
• [x] Modify MatchType::Enum and etc to have generics
• [x] Intoroduce MatchType::Method which has ImplHeader - [ ] Remove PathSearch TOO HARD
• [ ] Refactor TraitBounds again - [ ] Use GenericsArgs to resolve type params, instead of taking Match Now I think there's no use

enhance scope_start's inefficiency

• [ ] Have scope cache

Method search

• [x] rewrite method search using ImplHeader

TypeName resolution

• [x] resolve type parameter in ImplHeader when resolve_path is called

Related issues

• [ ] Generic type with multiple type parameter(#900) I think this will be easily fixed after refactoring all codes.

[letmutx]

Hi! Is struct member method completions working? I can't seem to get completions with the latest master. I am using the same example above

struct S<T> {
    mem: T
}
fn f<T: Clone>(a: S<T>) {
    let b = a.mem.clo~
}

$ RUST_LOG=racer=trace ../racer/target/debug/racer complete 5 21 src/main.rs 2> trace.txt
PREFIX 71,74,clo
END

trace.txt

Weirdly enough, the testcases in tests/trait_bounds.rs pass.

[kngwyu]

Thanks.

Weirdly enough, the testcases in tests/trait_bounds.rs pass.

Tests contain only 'bounded by impl' cases, like

impl<T: Clone> S<T> {
    fn f(self) {
        let b = a.mem.clo~
    } 
}

, so it's not weird. I don't remember it's simply not implemented or broken, but anyway fix it later.

[letmutx]

Right. I was obviously overlooking that. Sorry. I would like to take a go at this.

On Wed, Oct 17, 2018 at 7:29 AM Yuji Kanagawa notifications@github.com wrote:

Thanks.

Weirdly enough, the testcases in tests/trait_bounds.rs pass.

Tests contain only 'bounded by impl' cases, like

impl S { fn f(self) { let b = a.mem.clo~ } }

, so it's not weird. I don't remember it's simply not implemented or broken, but anyway fix it later.

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[kngwyu]

@letmutx Thanks, but I want to fix this by myself, to recall what I implemented in last month.

[letmutx]

@kngwyu Okay. I have some progress here: https://github.com/letmutx/racer/tree/add-struct-member-trait-completions