Change the symbol used for casting to ▶.

This removes the ambiguity between using :: for explicitly casting and for
showing the type of an expression.

diff --git a/Chapters/Normalization.tex b/Chapters/Normalization.tex
index cdd57bb9c52da6a0d885ae2cadf02d114f76f548..c42aa3a72031c7e52d4123a6b452c3e8e58ebeef 100644 (file)
--- a/Chapters/Normalization.tex
+++ b/Chapters/Normalization.tex
@@ -230,7 +230,7 @@
       let
         -- Unpack the state by coercion (\eg, cast from
         -- State (Word, Word) to (Word, Word))
-        s = sp :: (Word, Word)
+        s = sp ▶ (Word, Word)
         -- Extract both registers from the state
         r1 = case s of (a, b) -> a
         r2 = case s of (a, b) -> b
@@ -250,7 +250,7 @@
         s' = (,) r1' r2'
         -- pack the state by coercion (\eg, cast from
         -- (Word, Word) to State (Word, Word))
-        sp' = s' :: State (Word, Word)
+        sp' = s' ▶ State (Word, Word)
         -- Pack our return value
         res = (,) sp' out
       in
@@ -334,8 +334,8 @@
       \italic{toplet} = letrec [\italic{binding}...] in var (representable(varvar))
       \italic{binding} = var = \italic{rhs} (representable(rhs))
                        -- State packing and unpacking by coercion
-                       | var0 = var1 :: State ty (lvar(var1))
-                       | var0 = var1 :: ty (var0 :: State ty) (lvar(var1))
+                       | var0 = var1 ▶ State ty (lvar(var1))
+                       | var0 = var1 ▶ ty (var0 :: State ty) (lvar(var1))
       \italic{rhs} = userapp
                    | builtinapp
                    -- Extractor case

diff --git a/Chapters/Prototype.tex b/Chapters/Prototype.tex
index 6db0d8632e089e810e5735c09b00ee068a1391cc..78f5ecfb85047a16c4f02e3dd31f5023c1c5e513 100644 (file)
--- a/Chapters/Prototype.tex
+++ b/Chapters/Prototype.tex
@@ -463,7 +463,7 @@
     \startdesc{Cast expression}
       \defref{cast expression}
       \startlambda
-      body :: targettype
+      body ▶ targettype
       \stoplambda
       A cast expression allows you to change the type of an expression to an
       equivalent type. Note that this is not meant to do any actual work, like
@@ -487,7 +487,7 @@
       The value of a cast is the value of its body, unchanged. The type of this
       value is equal to the target type, not the type of its body.
 
-      \todo{Move this paragraph}
+      \todo{Move and update this paragraph}
       Note that this syntax is also used sometimes to indicate that a particular
       expression has a particular type, even when no cast expression is
       involved. This is then purely informational, since the only elements that