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Avoid unbounded O(n^2) when parsing nested type args
When encountering code like `f::<f::<f::<f::<f::<f::<f::<f::<...` with unmatched closing angle brackets, add a linear check that avoids the exponential behavior of the parse recovery mechanism. Fix #117080.
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,13 @@ | ||
trait Mul<T> { | ||
type Output; | ||
} | ||
trait Matrix: Mul<<Self as Matrix>::Row, Output = ()> { | ||
type Row; | ||
type Transpose: Matrix<Row = Self::Row>; | ||
} | ||
fn is_mul<S, T: Mul<S, Output = ()>>() {} | ||
fn f<T: Matrix>() { | ||
is_mul::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<>(); | ||
//~^ ERROR expected one of `!`, `+`, `,`, `::`, or `>`, found `(` | ||
} | ||
fn main() {} |
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Original file line number | Diff line number | Diff line change |
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error: expected one of `!`, `+`, `,`, `::`, or `>`, found `(` | ||
--> $DIR/deep-unmatched-angle-brackets.rs:10:415 | ||
| | ||
LL | ...::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<>(); | ||
| ^ expected one of `!`, `+`, `,`, `::`, or `>` | ||
| | ||
help: you might have meant to end the type parameters here | ||
| | ||
LL | is_mul::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<f::<>>(); | ||
| + | ||
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||
error: aborting due to previous error | ||
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