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add unit test for match var hygiene

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John Clements 2014-06-24 16:34:03 -07:00
parent 19e1d834ff
commit bc837fdadf
1 changed files with 12 additions and 0 deletions
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12
src/libsyntax/ext/expand.rs
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@ -1254,6 +1254,18 @@ mod test {
0) 0)
} }
// FIXME #9384, match variable hygiene. Should expand into
// fn z() {match 8 {x_1 => {match 9 {x_2 | x_2 => x_2 + x_1}}}}
#[test] fn issue_9384(){
run_renaming_test(
&("macro_rules! bad_macro (($ex:expr) => ({match 9 {x | x => x + $ex}}))
fn z() {match 8 {x => bad_macro!(_x)}}",
// NB: the third "binding" is the repeat of the second one.
vec!(vec!(1),vec!(0),vec!(0)),
true),
0)
}
// create a really evil test case where a $x appears inside a binding of $x // create a really evil test case where a $x appears inside a binding of $x
// but *shouldnt* bind because it was inserted by a different macro.... // but *shouldnt* bind because it was inserted by a different macro....
// can't write this test case until we have macro-generating macros. // can't write this test case until we have macro-generating macros.