Add opt-in InputSig2 predicates to support a function-exit epilogue whose
placement depends on reachability (such as Go's deferred calls, run at
exit in last-in-first-out order):
- deferExitStep: language-provided exit-epilogue edges, wired into
explicitStep but excluded from the defer-free reachability.
- overridesCallableBodyExit: suppresses the default fall-through edge from
a body's "after" node to the normal exit, so the epilogue can be
interposed on fall-through paths.
To let a language compute the reachability gate for those edges without
observing them (and without a non-monotonic cycle through reachable):
- explicitStep is split into explicitStepCommon (defer-free) plus
deferExitStep, and defaultCfg now negates explicitStepCommon so default
evaluation does not depend on deferExitStep.
- succIgnoringDeferExit exposes the defer-free successor relation, typed
over PreControlFlowNode so it does not depend on reachable.
- getASuccessorIgnoringDeferredExit exposes the same relation as a
ControlFlowNode member for general use.
- isInOrderNode exposes a structural, reachability-free node-identity test
for use inside the negations a language needs when computing its gate.
- EntryNodeImpl is no longer private, so a language can identify the entry
node over PreControlFlowNode.
All InputSig2 additions default to none(), leaving other languages
unchanged.
Add FieldCardinality to Schema to track required/multiple per field,
populated from the ast_types.yml suffixes (bare = required single,
? = optional single, + = required multiple, * = optional multiple).
dump_ast_with_type_errors now emits:
<-- ERROR: missing required field 'name'
for any node in the output AST whose declared schema requires a field
that is absent from the actual node.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
When a {..expr} splice in an output template is empty (e.g. from an
optional capture that did not match), drop the field entirely rather
than emitting an empty named field. This lets a single rule with
optional captures replace what used to be two near-identical rules.
Also re-renders the corpus to drop the now-suppressed empty fields.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
