evancz/Elm — pull request #381 by bcdarwin (2013-12-11 00:15:55+00:00)
Title: Add check for duplicate constructors within the same unit

This is a proposed fix for #380. Comments welcome. `msg` and `dup` look a bit silly sitting at top level ...

This is implemented in the "front-end" in a way similar to the checks for duplicate definitions and type synonyms, and, as with those, you currently don't get line numbers.

There's still a problem involving data and types imported from the Prelude or `open`ed modules. I'll open a separate ticket for that.