Bootstrap cleanups

core/bootstrap/primitives.factor

@@ -55,6 +55,8 @@ num-types get f <array> builtins set
 
 bootstrapping? on
 
+[
+
 ! Create some empty vocabs where the below primitives and
 ! classes will go
 {
@@ -524,3 +526,5 @@ tuple
 
 ! Bump build number
 "build" "kernel" create build 1 + [ ] curry (( -- n )) define-declared
+
+] with-compilation-unit

core/bootstrap/stage1.factor

@@ -14,7 +14,8 @@ IN: bootstrap.stage1
 load-help? off
 { "resource:core" } vocab-roots set
 
-! Create a boot quotation for the target
+! Create a boot quotation for the target by collecting all top-level
+! forms into a quotation, surrounded by some boilerplate.
 [
     [
         ! Rehash hashtables first, since bootstrap.image creates