Joshua Nelson be2947d0b7 Give a better error message for duplicate built-in macros ...

Previously, this would say no such macro existed, but this was
misleading, since the macro _did_ exist, it was just already seen.

- Say where the macro was previously defined
- Add long-form error message

2020-09-01 08:34:17 -04:00

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src

Give a better error message for duplicate built-in macros

2020-09-01 08:34:17 -04:00

Cargo.toml

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