error[E0109]: type arguments are not allowed on self type
  --> $DIR/unmatched-arg-and-hir-arg-issue-126385.rs:9:37
   |
LL |     pub fn f(field: &[u32]) -> Self<u32> {
   |                                ---- ^^^ type argument not allowed
   |                                |
   |                                not allowed on self type
   |
note: `Self` is of type `MyStruct<'_>`
  --> $DIR/unmatched-arg-and-hir-arg-issue-126385.rs:4:12
   |
LL | pub struct MyStruct<'field> {
   |            ^^^^^^^^ `Self` corresponds to this type
...
LL | impl MyStruct<'_> {
   | ----------------- `Self` is on type `MyStruct` in this `impl`
help: the `Self` type doesn't accept type parameters, use the concrete type's name `MyStruct` instead if you want to specify its type parameters
   |
LL -     pub fn f(field: &[u32]) -> Self<u32> {
LL +     pub fn f(field: &[u32]) -> MyStruct<u32> {
   |

error: lifetime may not live long enough
  --> $DIR/unmatched-arg-and-hir-arg-issue-126385.rs:10:9
   |
LL |     pub fn f(field: &[u32]) -> Self<u32> {
   |                     -          --------- return type is MyStruct<'2>
   |                     |
   |                     let's call the lifetime of this reference `'1`
LL |         Self { field }
   |         ^^^^^^^^^^^^^^ associated function was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0109`.