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error: `<` is interpreted as a start of generic arguments for `u32`, not a comparison
--> $DIR/issue-42954.rs:13:19
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13 | $i as u32 < 0
| ^ - interpreted as generic arguments
| |
| not interpreted as comparison
...
19 | is_plainly_printable!(c);
| ------------------------- in this macro invocation
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help: if you want to compare the casted value then write:
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13 | ($i as u32) < 0
| ^^^^^^^^^^^
error: aborting due to previous error
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