errorstack

func Origin ¶

func Origin(err error) string

Origin extracts the deepest stack trace embedded in the unwrap chain of err and formats it like a Go stack trace with the innermost (error creation) frame first. It returns "" when no error in the chain carries a stack trace.

A stack captured during package initialization is treated as no stack at all: it belongs to a package-level sentinel's construction and points at runtime.doInit, never at the failure site. Skipping it lets the deepest run-time stack in the chain win, typically the site that wrapped the sentinel.