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clean up E0275 explanation

This commit is contained in:
Guillaume Gomez 2020-02-06 17:53:03 +01:00
parent 320ada6479
commit 37e7b46177
1 changed files with 6 additions and 4 deletions
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10
src/librustc_error_codes/error_codes/E0275.md
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@ -1,8 +1,6 @@
This error occurs when there was a recursive trait requirement that overflowed
before it could be evaluated. Often this means that there is unbounded
recursion in resolving some type bounds.
An evaluation of a trait requirement overflowed.
For example, in the following code:
Erroneous code example:
```compile_fail,E0275
trait Foo {}
@ -12,6 +10,10 @@ struct Bar<T>(T);
impl<T> Foo for T where Bar<T>: Foo {}
```
This error occurs when there was a recursive trait requirement that overflowed
before it could be evaluated. This often means that there is an unbounded
recursion in resolving some type bounds.
To determine if a `T` is `Foo`, we need to check if `Bar<T>` is `Foo`. However,
to do this check, we need to determine that `Bar<Bar<T>>` is `Foo`. To
determine this, we check if `Bar<Bar<Bar<T>>>` is `Foo`, and so on. This is