--- a/progs/fun-bare.scala	Sun Jul 28 21:10:39 2019 +0100
+++ b/progs/fun-bare.scala	Tue Jul 30 20:19:40 2019 +0100
@@ -1,5 +1,5 @@
 // A Small Compiler for a Simple Functional Language
-// (it does not use a parser and lexer)
+// (it does not include a parser and lexer)
 
 // Abstract syntax trees
 abstract class Exp
@@ -70,17 +70,18 @@
   x ++ "_" ++ counter.toString()
 }
 
-// convenient string interpolations 
-// for instructions, labels and methods
+// convenient string interpolations for
+// generating instructions, labels etc
 import scala.language.implicitConversions
 import scala.language.reflectiveCalls
 
 implicit def sring_inters(sc: StringContext) = new {
-    def i(args: Any*): String = "   " ++ sc.s(args:_*) ++ "\n"
-    def l(args: Any*): String = sc.s(args:_*) ++ ":\n"
-    def m(args: Any*): String = sc.s(args:_*) ++ "\n"
+  def i(args: Any*): String = "   " ++ sc.s(args:_*) ++ "\n"
+  def l(args: Any*): String = sc.s(args:_*) ++ ":\n"
+  def m(args: Any*): String = sc.s(args:_*) ++ "\n"
 }
 
+// variable / index environments
 type Env = Map[String, Int]
 
 // compile expressions