pub fn source_of(declared: Declared<'_>, store: &AuthStore) -> KeySourceExpand description
Where a provider’s key will come from, given what its config names.
The precedence rule itself, in one place. resolve applies it to a loaded
Config; doctor applies it to the raw TOML tree, which it has to read
separately so a ${VAR} prints as itself rather than being swallowed by the
variable-not-set error. Two readers of one rule is the shape
config::env_var_refs_in already exists to prevent: doctor once carried a
narrower copy of that scanner and reported a config as fine that check
refused to load.