typst/tests/typ/compiler/backtracking.typ
2024-02-21 08:38:47 +00:00

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// Ensure that parser backtracking doesn't lead to exponential time consumption.
// If this regresses, the test suite will not terminate, which is a bit
// unfortunate compared to a good error, but at least we know something is up.
//
// Ref: false
---
#{
let s = "(x: 1) => x"
let pat = "(x: {}) => 1 + x()"
for _ in range(50) {
s = pat.replace("{}", s)
}
test(eval(s)(), 51)
}
---
#{
let s = "(x) = 1"
let pat = "(x: {_}) = 1"
for _ in range(100) {
s = pat.replace("_", s)
}
// Error: 8-9 cannot destructure integer
eval(s)
}
---
// Test whitespace after memoized part.
#( (x: () => 1 ) => 1 )
// -------
// This is memoized and we want to ensure that whitespace after this
// is handled correctly.