error: expected `+` between lifetime and Sized
  --> $DIR/issue-102598.rs:1:20
   |
LL | fn foo<'a>(_: impl 'a Sized) {}
   |                    ^^
   |
help: add `+`
   |
LL | fn foo<'a>(_: impl 'a + Sized) {}
   |                       +

error: expected one of `:`, `@`, or `|`, found `)`
  --> $DIR/issue-102598.rs:1:28
   |
LL | fn foo<'a>(_: impl 'a Sized) {}
   |                            ^ expected one of `:`, `@`, or `|`
   |
   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a parameter name, give it a type
   |
LL | fn foo<'a>(_: impl 'a Sized: TypeName) {}
   |                            ++++++++++
help: if this is a type, explicitly ignore the parameter name
   |
LL | fn foo<'a>(_: impl 'a _: Sized) {}
   |                       ++

error: expected one of `)`, `+`, or `,`, found `Sized`
  --> $DIR/issue-102598.rs:1:23
   |
LL | fn foo<'a>(_: impl 'a Sized) {}
   |                      -^^^^^ expected one of `)`, `+`, or `,`
   |                      |
   |                      help: missing `,`

error: at least one trait must be specified
  --> $DIR/issue-102598.rs:1:15
   |
LL | fn foo<'a>(_: impl 'a Sized) {}
   |               ^^^^^^^

error: aborting due to 4 previous errors