Files
scriptc/tests/corpus
Malte UblandClaude Opus 5.5 f09e02255d Guard the X509 dynamic-value fence against recursive types
refuseX509DynValues walks a converted value's type looking for an
X509Certificate record, and it memoized only records (by shape id) and
unions (by union id). A type that reaches itself through an array, set,
map or promise has no id to memoize by, so `type Rec = string | Rec[]`
in a program that also holds a certificate recursed until the compiler
ran out of stack — a crash, not a diagnostic.

The walk now keeps an identity-based visited set over those kinds: a type
met again while it is still being visited answers false, the least fixed
point of reachability, since nothing outside the cycle makes a
certificate reachable. Unions keep their memo, which now also covers a
union cycle that names one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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