Fix an implied bounds bug #206
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bors
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(WIP) Small fixes in chalkification
Small fixes around region constraints and builtin impls. There are still some type inference errors, for example the following code errors out:
```rust
fn main() {
let mut x: Vec<i32> = Vec::new();
// ^^^^^^^^ cannot infer type for `std::vec::Vec<_>`
}
```
but explicitly specifying `Vec::<i32>::new` works.
With these few fixes, the following code now passes type-checking:
```rust
fn main() {
let mut x: Vec<i32> = Vec::<i32>::new();
x.push(5);
println!("{:?}", x);
}
```
I also fixed the implied bounds bug as discussed on Zulip and in rust-lang/chalk#206
cc @tmandry
r? @nikomatsakis
scalexm
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scalexm
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r? @nikomatsakis
Let's find some time to discuss again about this
WellFormed/FromEnvduality. The proof I mentioned for soundness of the implied bounds setup did not model implied bounds from types, only those from traits. But I now understand better therecursive_where_clause_on_typetest, how implied bounds from types and traits intertwine, and why this fix is the correct one.