Commits on Feb 7, 2021

1. Add --extern-loc to augment unused crate dependency diagnostics …

   This allows a build system to indicate a location in its own dependency
   specification files (eg Cargo's `Cargo.toml`) which can be reported
   along side any unused crate dependency.
   
   This supports several types of location:
    - 'json' - provide some json-structured data, which is included in the json diagnostics
        in a `tool_metadata` field
    - 'raw' - emit the provided string into the output. This also appears as a json string in
        `tool_metadata`.
   
   If no `--extern-location` is explicitly provided then a default json entry of the form
   `"tool_metadata":{"name":<cratename>,"path":<cratepath>}` is emitted.

   

   jsgf committed Feb 7, 2021
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2. Implement Encoder for Diagnostic manually …

   ...so we can skip serializing `tool_metadata` if it hasn't been set.
   This makes the output a bit cleaner, and avoiding having to update a
   bunch of unrelated tests.

   

   jsgf committed Feb 7, 2021
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3. Make sure all fields are accounted for in encode_fields! …

   This will make sure the encoder will get updated if any new fields are
   added to Diagnostic.

   

   jsgf committed Feb 7, 2021
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