Move inline forall in function definitions

* Previously we allowed the following bizarre syntax for a forall
  quantifier on a function:

  val foo(arg1: int('n), arg2: typ2) -> forall 'n, 'n >= 0. unit

  this commit changes this to the more sane:

  val foo forall 'n, 'n >= 2. (arg1: int('n), arg2: typ2) -> unit

  Having talked about it today, we could consider adding the syntax

  val foo where 'n >= 2. (arg1: int('n), arg2: typ2) -> unit

  which would avoid the forall (by implicitly quantifying variables in
  the constraint), and be slightly more friendly especially for
  documentation purposes. Only RISC-V used this syntax, so all uses of
  it there have been switched to the new style.

* Second, there is a new (somewhat experimental) syntax for
  existentials, that is hopefully more readable and closer to
  minisail:

  val foo(x: int, y: int) -> int('m) with 'm >= 2

  "type('n) with constraint" is equivalent to minisail: {'n: type | constraint}
  the type variables in typ are implicitly quantified, so this is equivalent to
  {'n, constraint. typ('n)}

  In order to make this syntax non-ambiguous we have to use == in
  constraints rather than =, but this is a good thing anyway because
  the previous situation where = was type level equality and == term
  level equality was confusing. Now all the type type-level and
  term-level operators can be consistent. However, to avoid breaking
  anything = is still allowed in non-with constraints, and produces a
  deprecated warning when parsed.

1 files changed, 1 insertions, 1 deletions

diff --git a/editors/sail2-mode.el b/editors/sail2-mode.el
index de8c3d11..ac3c199c 100644
--- a/editors/sail2-mode.el
+++ b/editors/sail2-mode.el
@@ -9,7 +9,7 @@
     "overload" "cast" "sizeof" "constraint" "default" "assert" "newtype" "from"
     "pure" "infixl" "infixr" "infix" "scattered" "end" "try" "catch" "and" "to"
     "throw" "clause" "as" "repeat" "until" "while" "do" "foreach" "bitfield"
-    "mapping" "where"))
+    "mapping" "where" "with"))
 
 (defconst sail2-kinds
   '("Int" "Type" "Order" "inc" "dec"