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error: invalid `?` in type
--> $DIR/issue-84148-1.rs:1:14
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LL | fn f(t:for<>t?)
| ^ `?` is only allowed on expressions, not types
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help: if you meant to express that the type might not contain a value, use the `Option` wrapper type
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LL | fn f(t:Option<for<>t>)
| +++++++ ~
error: expected one of `->`, `where`, or `{`, found `<eof>`
--> $DIR/issue-84148-1.rs:1:15
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LL | fn f(t:for<>t?)
| ^ expected one of `->`, `where`, or `{`
error: aborting due to 2 previous errors
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