error[E0284]: type annotations needed: cannot normalize `build<_>::{opaque#0}`
  --> $DIR/recursive-in-exhaustiveness.rs:20:5
   |
LL |     build(x)
   |     ^^^^^^^^ cannot normalize `build<_>::{opaque#0}`

error[E0271]: type mismatch resolving `build2<(_,)>::{opaque#0} normalizes-to _`
  --> $DIR/recursive-in-exhaustiveness.rs:30:6
   |
LL |     (build2(x),)
   |      ^^^^^^^^^ types differ

error[E0271]: type mismatch resolving `build2<(_,)>::{opaque#0} normalizes-to _`
  --> $DIR/recursive-in-exhaustiveness.rs:30:5
   |
LL |     (build2(x),)
   |     ^^^^^^^^^^^^ types differ

error[E0277]: the size for values of type `(impl Sized,)` cannot be known at compilation time
  --> $DIR/recursive-in-exhaustiveness.rs:30:5
   |
LL |     (build2(x),)
   |     ^^^^^^^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `(impl Sized,)`
   = note: tuples must have a statically known size to be initialized

error[E0271]: type mismatch resolving `build3<(T,)>::{opaque#0} normalizes-to _`
  --> $DIR/recursive-in-exhaustiveness.rs:41:17
   |
LL |     let (x,) = (build3((x,)),);
   |                 ^^^^^^^^^^^^ types differ

error[E0277]: the size for values of type `(impl Sized,)` cannot be known at compilation time
  --> $DIR/recursive-in-exhaustiveness.rs:41:16
   |
LL |     let (x,) = (build3((x,)),);
   |                ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `(impl Sized,)`
   = note: tuples must have a statically known size to be initialized

error[E0308]: mismatched types
  --> $DIR/recursive-in-exhaustiveness.rs:41:16
   |
LL | fn build3<T>(x: T) -> impl Sized {
   |                       ---------- the found opaque type
LL |
LL |     let (x,) = (build3((x,)),);
   |                ^^^^^^^^^^^^^^^ types differ
   |
   = note: expected type `_`
             found tuple `(impl Sized,)`

error[E0271]: type mismatch resolving `build3<(T,)>::{opaque#0} normalizes-to _`
  --> $DIR/recursive-in-exhaustiveness.rs:41:17
   |
LL |     let (x,) = (build3((x,)),);
   |                 ^^^^^^^^^^^^ types differ
   |
   = note: the return type of a function must have a statically known size

error[E0271]: type mismatch resolving `build3<(T,)>::{opaque#0} normalizes-to _`
  --> $DIR/recursive-in-exhaustiveness.rs:41:16
   |
LL |     let (x,) = (build3((x,)),);
   |                ^^^^^^^^^^^^^^^ types differ

error[E0271]: type mismatch resolving `build3<(T,)>::{opaque#0} normalizes-to _`
  --> $DIR/recursive-in-exhaustiveness.rs:41:17
   |
LL |     let (x,) = (build3((x,)),);
   |                 ^^^^^^^^^^^^ types differ
   |
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 10 previous errors

Some errors have detailed explanations: E0271, E0277, E0284, E0308.
For more information about an error, try `rustc --explain E0271`.