Domains example

[hcoop/domtool2.git] / src / ast.sml

diff --git a/src/ast.sml b/src/ast.sml
index b48f13e..0c6ddd1 100644 (file)
--- a/src/ast.sml
+++ b/src/ast.sml
@@ -48,7 +48,7 @@ datatype typ' =
        *  - Is valid in the given pred
        *  - Expects an environment compatible with the first record
        *  - Modifies it according to the second record *)
-       | TNested of pred * pred
+       | TNested of pred * typ
        (* Allow nested configuration, in the form of a function from an action
        * satisfying the first predicate to an action satisfying the second and
        * with the same environment variable IO behavior. *)
@@ -84,9 +84,9 @@ datatype exp' =
        (* Get an environment variable *)
        | ESeq of exp list
        (* Monad sequencer; execute a number of commands in order *)
-       | ELocal of exp
-       (* Local execution; execute the action and then restore the previous
-       * environment. *)
+       | ELocal of exp * exp
+       (* Local execution; like ESeq, but the writes of the first
+       * action are abandoned *)
        | EWith of exp * exp
        (* Apply a TNested to an action *)
 withtype exp = exp' * position