"github.com/jackc/pgx/v5" is not open

Why can't my other go source files find function definitions after importing the package "github. com/jackc/pgx/v5/pgxpool"

Start by reproducing the import of github.com/jackc/pgx/v5/pgxpool in a small Go source file and capture the exact error about the package not being open. Compare the failing import with the repository's documented package layout; done means other Go files can resolve the package's function definitions.

Written by the indexing model from the issue text.