warning: not reporting region error due to -Znll
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:45:9
   |
LL |         require(&x, &y)
   |         ^^^^^^^

warning: not reporting region error due to -Znll
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:79:9
   |
LL |         require(&x, &y)
   |         ^^^^^^^

note: External requirements
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:38:26
   |
LL |       with_signature(a, b, |x, y| {
   |  __________________________^
LL | |         //~^ ERROR the parameter type `T` may not live long enough
LL | |         //
LL | |         // See `correct_region`, which explains the point of this
...  |
LL | |         //~^ WARNING not reporting region error due to -Znll
LL | |     })
   | |_____^
   |
   = note: defining type: DefId(0/1:16 ~ ty_param_closure_outlives_from_where_clause[317d]::no_region[0]::{{closure}}[0]) with closure substs [
               T,
               i32,
               extern "rust-call" fn((std::cell::Cell<&'_#1r ()>, T))
           ]
   = note: number of external vids: 2
   = note: where T: '_#1r

error[E0309]: the parameter type `T` may not live long enough
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:38:26
   |
LL |       with_signature(a, b, |x, y| {
   |  __________________________^
LL | |         //~^ ERROR the parameter type `T` may not live long enough
LL | |         //
LL | |         // See `correct_region`, which explains the point of this
...  |
LL | |         //~^ WARNING not reporting region error due to -Znll
LL | |     })
   | |_____^
   |
   = help: consider adding an explicit lifetime bound `T: ReFree(DefId(0/0:6 ~ ty_param_closure_outlives_from_where_clause[317d]::no_region[0]), BrNamed(crate0:DefIndex(1:14), 'a))`...

note: No external requirements
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:37:1
   |
LL | / fn no_region<'a, T>(a: Cell<&'a ()>, b: T) {
LL | |     with_signature(a, b, |x, y| {
LL | |         //~^ ERROR the parameter type `T` may not live long enough
LL | |         //
...  |
LL | |     })
LL | | }
   | |_^
   |
   = note: defining type: DefId(0/0:6 ~ ty_param_closure_outlives_from_where_clause[317d]::no_region[0]) with substs [
               T
           ]

note: External requirements
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:55:26
   |
LL |       with_signature(a, b, |x, y| {
   |  __________________________^
LL | |         // Key point of this test:
LL | |         //
LL | |         // The *closure* is being type-checked with all of its free
...  |
LL | |         require(&x, &y)
LL | |     })
   | |_____^
   |
   = note: defining type: DefId(0/1:19 ~ ty_param_closure_outlives_from_where_clause[317d]::correct_region[0]::{{closure}}[0]) with closure substs [
               '_#1r,
               T,
               i32,
               extern "rust-call" fn((std::cell::Cell<&'_#2r ()>, T))
           ]
   = note: number of external vids: 3
   = note: where T: '_#2r

note: No external requirements
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:51:1
   |
LL | / fn correct_region<'a, T>(a: Cell<&'a ()>, b: T)
LL | | where
LL | |     T: 'a,
LL | | {
...  |
LL | |     })
LL | | }
   | |_^
   |
   = note: defining type: DefId(0/0:7 ~ ty_param_closure_outlives_from_where_clause[317d]::correct_region[0]) with substs [
               '_#1r,
               T
           ]

note: External requirements
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:76:26
   |
LL |       with_signature(a, b, |x, y| {
   |  __________________________^
LL | |         //~^ ERROR the parameter type `T` may not live long enough
LL | |         // See `correct_region`
LL | |         require(&x, &y)
LL | |         //~^ WARNING not reporting region error due to -Znll
LL | |     })
   | |_____^
   |
   = note: defining type: DefId(0/1:23 ~ ty_param_closure_outlives_from_where_clause[317d]::wrong_region[0]::{{closure}}[0]) with closure substs [
               '_#1r,
               T,
               i32,
               extern "rust-call" fn((std::cell::Cell<&'_#2r ()>, T))
           ]
   = note: number of external vids: 3
   = note: where T: '_#2r

error[E0309]: the parameter type `T` may not live long enough
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:76:26
   |
LL |       with_signature(a, b, |x, y| {
   |  __________________________^
LL | |         //~^ ERROR the parameter type `T` may not live long enough
LL | |         // See `correct_region`
LL | |         require(&x, &y)
LL | |         //~^ WARNING not reporting region error due to -Znll
LL | |     })
   | |_____^
   |
   = help: consider adding an explicit lifetime bound `T: ReFree(DefId(0/0:8 ~ ty_param_closure_outlives_from_where_clause[317d]::wrong_region[0]), BrNamed(crate0:DefIndex(1:20), 'a))`...

note: No external requirements
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:72:1
   |
LL | / fn wrong_region<'a, 'b, T>(a: Cell<&'a ()>, b: T)
LL | | where
LL | |     T: 'b,
LL | | {
...  |
LL | |     })
LL | | }
   | |_^
   |
   = note: defining type: DefId(0/0:8 ~ ty_param_closure_outlives_from_where_clause[317d]::wrong_region[0]) with substs [
               '_#1r,
               T
           ]

note: External requirements
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:90:26
   |
LL |       with_signature(a, b, |x, y| {
   |  __________________________^
LL | |         // See `correct_region`
LL | |         require(&x, &y)
LL | |     })
   | |_____^
   |
   = note: defining type: DefId(0/1:27 ~ ty_param_closure_outlives_from_where_clause[317d]::outlives_region[0]::{{closure}}[0]) with closure substs [
               '_#1r,
               '_#2r,
               T,
               i32,
               extern "rust-call" fn((std::cell::Cell<&'_#3r ()>, T))
           ]
   = note: number of external vids: 4
   = note: where T: '_#3r

note: No external requirements
  --> $DIR/ty-param-closure-outlives-from-where-clause.rs:85:1
   |
LL | / fn outlives_region<'a, 'b, T>(a: Cell<&'a ()>, b: T)
LL | | where
LL | |     T: 'b,
LL | |     'b: 'a,
...  |
LL | |     })
LL | | }
   | |_^
   |
   = note: defining type: DefId(0/0:9 ~ ty_param_closure_outlives_from_where_clause[317d]::outlives_region[0]) with substs [
               '_#1r,
               '_#2r,
               T
           ]

error: aborting due to 2 previous errors

If you want more information on this error, try using "rustc --explain E0309"