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error: expected expression, found `let` statement
--> $DIR/macro-expanded.rs:7:20
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LL | ($e:expr) => { let Some(x) = $e }
| ^^^
...
LL | () if m!(Some(5)) => {}
| ----------- in this macro invocation
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= note: only supported directly in conditions of `if` and `while` expressions
= note: this error originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to previous error
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