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error: `<` is interpreted as a start of generic arguments for `u32`, not a comparison
--> $DIR/issue-42954.rs:7:19
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LL | $i as u32 < 0
| ^ - interpreted as generic arguments
| |
| not interpreted as comparison
...
LL | is_plainly_printable!(c);
| ------------------------ in this macro invocation
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= note: this error originates in the macro `is_plainly_printable` (in Nightly builds, run with -Z macro-backtrace for more info)
help: try comparing the cast value
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LL | ($i as u32) < 0
| + +
error: aborting due to 1 previous error
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