precedence of let and comma is awkward

[cyrus-]

[disconcision]

@cyrus- how do you feel about just moving to obligate parentheses for tuples? would address multiple issues.

[cyrus-]

Not sure how the error reporting will work when there aren't parens? There would still need to a parse...

[disconcision]

outside parens/brackets i would think they should behave like undefined infix operators currently do; highlit in red, parsed as multihole. i think this is possible implementation wise but i might be underthinking it

[disconcision]

(implementation wise i think a direct fix to this issue is also non-straightforward; i'm not actually sure this is a regression? this seems intrinsic to the way n-ary ops are currently handled)

[disconcision]

actually nm this is a regression... it also breaks case expressions (if you have a bare tuple in the scrutinee)