fn parse_regproc(s: &str) -> Result<u32, Box<dyn Error + Sync + Send>>Expand description
Parses the text format of a regproc, matching PostgreSQL’s regprocin.
Accepting names is what keeps a COPY ... TO rendering loadable by
COPY ... FROM, since the text encoding emits names. An overloaded name
renders schema-qualified and names every one of its impls, so it does not
round trip, which is true of PostgreSQL as well.