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abc115972e
Fix printing multiple warning messages for unused fields in [registries] table Cargo currently prints the same warning message multiple times for unexpected fields in the `[registries.<registry>]` or `[registry]` tables. This is because Cargo warns each time that the structure is deserialized from `Config`. Depending on which code path is taken I've seen the warning printed up to 6 times. * A cache of deserialized registry configurations is added to the `Config` struct. * Registry authentication is changed to directly read the config when searching for a registry name, rather than deserializing each registry configuration. A test is added to ensure both `[registries]` and `[registry]` only warn once for unexpected fields.