type StateIdx = u32;
The integer type used for the state index.
Limiting this to 32 bit integers can have a big impact on memory usage
when using the Sparse transition representation.
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct, enum,
trait, typedef (or
tdef).
Search functions by type signature (e.g.
vec -> usize)