403bb097fc
Indicate origin of where type parameter for uninferred types Based on #65951 (which is not merge yet), fixes #67277. This PR improves a little the diagnostic for code like: ``` async fn foo() { bar().await; } async fn bar<T>() -> () {} ``` by showing: ``` error[E0698]: type inside `async fn` body must be known in this context --> unresolved_type_param.rs:9:5 | 9 | bar().await; | ^^^ cannot infer type for type parameter `T` declared on the function `bar` | ... ``` (The ``` declared on the function `bar` ``` part is new) A small side note: `Vec` and `slice` seem to resist this change, because querying `item_name()` panics, and `get_opt_name()` returns `None`. r? @estebank
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