Revert commit 18796b6aea453bdeef1ad12ce80eeb220bf01e67, close 3080

This reverts 18796b6aea453bdeef1ad12ce80eeb220bf01e67 (Slight change
in the semantics of arguments scopes: scopes can no longer be bound to
Funclass or Sortclass (this does not seem to be useful)).  It is
useful to have function_scope for, e.g., function composition.  This
allows users to, e.g., automatically interpret ∘ as morphism
composition when expecting a morphism of categories, as functor
composition when expecting a functor, and as function composition when
expecting a function.

Additionally, it is nicer to have fewer special cases in the OCaml
code, and give more things a uniform syntax.  (The scope type_scope
should not be special-cased; this change is coming up next.)

Also explicitly define [function_scope] in theories/Init/Notations.v.

This closes bug #3080, Build a [function_scope] like [type_scope], or allow
[Bind Scope ... with Sortclass] and [Bind Scope ... with Funclass]

We now mention Funclass and Sortclass in the documentation of [Bind Scope]
again.

1 files changed, 2 insertions, 1 deletions

diff --git a/test-suite/output/InitSyntax.out b/test-suite/output/InitSyntax.out
index bbfd3405af..c17c63e724 100644
--- a/test-suite/output/InitSyntax.out
+++ b/test-suite/output/InitSyntax.out
@@ -4,7 +4,8 @@ Inductive sig2 (A : Type) (P Q : A -> Prop) : Type :=
 For sig2: Argument A is implicit
 For exist2: Argument A is implicit
 For sig2: Argument scopes are [type_scope type_scope type_scope]
-For exist2: Argument scopes are [type_scope _ _ _ _ _]
+For exist2: Argument scopes are [type_scope function_scope function_scope _ _
+              _]
 exists x : nat, x = x
      : Prop
 fun b : bool => if b then b else b