Fix parse error with non-literal after minus sign #373
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Currently failing:
error: unexpected token: `b`
--> tests/test_ensure.rs:138:44
|
138 | let test = || Ok(ensure!(a <= b || a - b <= 10));
| ^
|
::: src/ensure.rs:319:117
|
319 | (atom $stack:tt $bail:tt (~$($fuel:tt)*) {($($buf:tt)*) $($parse:tt)*} ($dot:tt $ident:tt $colons:tt $larrow:tt $lit:literal $($dup:tt)*) . $i:ident :: <- $($rest:tt)*) => {
| ------------ while parsing argument for this `literal` macro fragment
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Fixes #372.