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The runtime had weak.runtime_registerWeakPointer but not its counterpart, so a program that reads a weak pointer back did not link. crypto/tls does this in the certificate cache that it keeps behind a weak.Pointer. Weak pointers are not weak here. registerWeakPointer returns the pointer that it got, so the value it refers to stays and the way back to a strong pointer is the identity too. weak.Pointer.Value thus never reports a collected value, which the documented contract permits. testdata/weak.go does not link on the current dev branch and prints the expected value with this change.
This was referenced Sep 17, 2026
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Addresses #5693. Programs that call
weak.Pointer.Value()fail to link. Add the missing runtime hook and a test that reads a live value.The hook matches the existing pointer registration behavior. It does not add weak pointer collection. Hosted TLS in #5700 needs this hook.
Replaces #5633, closed on 17 September 2026 with a request for an issue first. Based on
devat93940cb6. Patches are unchanged after rebase. Formatting and whitespace checks pass. New runtime tests and CI are pending.