pub type BuiltinComponentDeclared = fn(&str) -> bool;Expand description
Resolves whether a built-in rule name is declared as a component, regardless of whether its host ships.
The sibling of BuiltinComponent that answers a different question. BuiltinComponent
answers None for a name that is not a component and for one whose row names a host this
build does not ship; this hook tells the two apart, so the resolver can refuse the broken
row as a lanekeep bug rather than report a misspelling or serve a stale source.