[tialaramex]

For me it seems to almost exactly fit my model of how things ought to work, and of course the diagnostics are so much better than most languages.

We saw the other day where C and C++ just let you write what seems reasonable but then they do something insane, D says no, that's a syntax error, but Rust's diagnostic gives a name to what you intended, says you can't do that, and suggests how to write it instead.

  if (a < b < c)

C and C++ think that's doing a comparison, coercing the boolean result to whatever type to compare it with the remaining variable, and then acting on the new boolean result. D says that's a syntax error because there should be a closing parenthesis after the variable "b". Rust says "comparison operators cannot be chained" and suggests a < b && b < c

Edited to add:

Swift says: adjacent operators are in non-associative precedence group 'ComparisonPrecedence' -- which is definitely better than D, but it doesn't offer the helpful suggestion.