Confusing error message with < binop

lib.rs:11:21: 11:23 error: expected type, found token LIT_INT_UNSUFFIXED(16i64)
lib.rs:11     if foo as int < 16 {}

The solution is of course to parenthesize the cast so it doesn't get parsed as generics, but the error message does not help at all.

This error got a little better:

hello.rs:3:21: 3:22 error: expected type, found `5`
hello.rs:3     if i as usize < 5 {
                               ^

Triage: no change.

Closing in favor of #22644.

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