pub unsafe fn text_root(text: GcRef) -> (GcRef, usize)Expand description
The root owned Text behind text, and the absolute offset at which
text’s own bytes begin inside it.
A SourceSlice may name another SourceSlice, so “the owner” is in general
a chain. The parser refuses to extend one: parse(t, P) over a t that is
itself a slice would otherwise allocate slices of a slice, and every Text
that parse produced would pay the chain’s depth on every read. Resolving
once, when the Input is built, keeps every
slice the interpreter allocates exactly one level deep.
§Safety
text must be a live Text GcRef, and every owner along its chain must
point at a live Text.