Module parser

Enums

• AssocOp
  Associative operator with precedence.
• ExprPrecedence
• Fixity

Constants

• PREC_CLOSURE
• PREC_FORCE_PAREN
• PREC_JUMP
• PREC_PREFIX
• PREC_RANGE
• PREC_UNAMBIGUOUS

Functions

• contains_exterior_struct_lit
  Expressions that syntactically contain an “exterior” struct literal i.e., not surrounded by any parens or other delimiters, e.g., X { y: 1 }, X { y: 1 }.method(), foo == X { y: 1 } and X { y: 1 } == foo all do, but (X { y: 1 }) == foo does not.
• needs_par_as_let_scrutinee
  Suppose we have let _ = e and the order of e. Is the order such that e in let _ = e needs parentheses when it is on the RHS?
• prec_let_scrutinee_needs_par
  In let p = e, operators with precedence <= this one requires parentheses in e.