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Expressions: an expression can't change which layer a kept layer is

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tylerjenningsw
2026-10-27 14:04:10 -04:00
parent 754ed2fe84
commit 5c23bda95d
1 changed files with 6 additions and 2 deletions
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crates/expr/src/prelude.js
+6 -2
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@@ -550,8 +550,12 @@ function Layer(c, l) {
delete f.name;
delete f.length;
Object.setPrototypeOf(f, Layer.prototype);
f.__c = c; f.__l = l; f.__i = null; f.__s = null;
// Kept across evaluations (`__layer`), so an expression can't leave its own fields on one.
// Kept across evaluations (`__layer`), so an expression can't change which layer it is or leave
// its own fields on it. `__i` and `__s` stay writable: `__info` reads them again in an evaluation
// whose `__S` isn't `__s`, and every evaluation has a new `__S`.
Object.defineProperty(f, '__c', { value: c });
Object.defineProperty(f, '__l', { value: l });
f.__i = null; f.__s = null;
Object.preventExtensions(f);
return f;
}