Though it won't be implemented until after MVP, it would be a breaking change to add the mut keyword to the syntax. To avoid that, add the keyword now and just leave it unenforced until that can be implemented.
[x] Add mut to grammar
[x] Update examples
[x] Document that mut is unenforced for the time-being but will get statically checked soon (change log is sufficient)
Though it won't be implemented until after MVP, it would be a breaking change to add the
mutkeyword to the syntax. To avoid that, add the keyword now and just leave it unenforced until that can be implemented.mutto grammarmutis unenforced for the time-being but will get statically checked soon (change log is sufficient)Static checking will be added in #64.