Unresolved errors in EDN files with non-standard extensions #2564
Description
I'm playing around with Wasm, and decided I'd use Cursive to edit *.wat files (which are S-expression based, see https://developer.mozilla.org/en-US/docs/WebAssembly/Understanding_the_text_format).
I associated *.wat with the EDN file type, expecting it to be the perfect editor for WebAssembly Text files. The only problem is: every symbol in the file is highlighted as "unresolved":
If .edn extension is used, there are no warnings!
