Support multiple extensions in (dialect) patterns #7777
Description
Desired Behavior
Dream currently recommends .eml.ml files, to take advantage of partial syntax highlighting of their ML parts. This is currently not possible with (dialect):
(lang dune 2.0)
(dialect
(name eml)
(implementation
(extension eml.ml)
(preprocess (run %{bin:dream_eml} --stdout %{input-file})))
(interface
(extension emli)
(format (run cat))))
results in
Entering directory '/home/antron/code/dreamworld'
File "dream/example/7-template/dune-project", line 6, characters 13-19:
6 | (extension eml.ml)
^^^^^^
Error: extension must not contain '.'
Is it possible to support such extensions?
Example
(lang dune 2.0)
(dialect
(name eml)
(implementation
(extension eml.ml)
(preprocess (run %{bin:dream_eml} --stdout %{input-file})))
(interface
(extension emli)
(format (run cat))))