add two new examples from Kiyoshi

FossilOrigin-Name: 4f930733947c1331f846262d820152b2a6276dc9cd7cf1fa307129dbff71157c

RELEASE_NOTES.md

@@ -97,9 +97,12 @@ June 2019.
 
 ## Examples
 
+- add Abort.forth
 - add Buffer.forth
 - add CaptureOutput.forth
 - add DisplayNames.forth
+- add EvaluateString.forth
+- add Forget.forth
 - add HTML.forth
 - add KeyValueStore.forth
 - add Marker.forth

example/EvaluateString.forth

@@ -0,0 +1,15 @@
+## s:(evaluate)
+
+Show string being evaluated
+
+~~~
+:s:() (s-) nl '(_ s:prepend '_) s:append s:put nl ;
+:s:(evaluate) (s-) dup s:() s:evaluate nl ;
+~~~
+
+``` 
+:s:testing (s--) 'Testing_ s:prepend s:put nl ;
+'s:(evaluate) s:testing
+'#2_#3_#136_dump-stack s:(evaluate)
+'reset_dump-stack s:(evaluate)
+```

example/Forget.forth

@@ -0,0 +1,67 @@
+# Forget
+
+This is an alternative to `mark`.
+
+As a byproduct you get `hide` which hides a word from later
+dictionary search.
+
+~~~
+:d:exists? d:lookup n:zero? ;
+'abort d:exists? [ 'example/Abort.forth include ] if
+'s:(evaluate) d:exists? [ 'example/EvaluateString.forth include ] if
+~~~
+
+## EOC (end-of-code)
+
+~~~
+:d:size (-) #0 [ d:name drop #1 + ] d:for-each ; 
+:d:words.last (n-) 
+  &Dictionary swap [ fetch dup d:name s:put sp d:link ] times drop ; 
+:EOC (-) 'EOC_(end-of-code) s:shout 
+  d:size '%n_words_defined s:format s:put nl 
+  #4 [ '%n_last_defined_words: s:format s:put sp ] sip d:words.last listen ; 
+~~~
+
+## d:hide 
+
+~~~
+{{ 
+  'This 'Newer [ var ] bi@ 
+  :names-match? (a-f) d:name here s:eq? ; 
+  :word-exists?continue (s-s) [ dup d:lookup ] assert ; 
+  :d:newer-older (s-aa)_newer_older word-exists?continue 
+    here s:copy d:last #0 !Newer [ dup names-match? 
+    [ @Newer TRUE ] [ dup !Newer d:link fetch FALSE ] choose 
+    ] until (this_newer) swap d:link fetch (older) ; 
+  :exist?continue (aa-aa) [ dup-pair [ n:-zero? ] bi@ and ] assert ; 
+---reveal--- 
+  :d:newer (s-a) d:newer-older drop ; 
+  :d:hide (s-) d:newer-older exist?continue swap d:link store ; 
+}} 
+~~~
+
+
+```
+:a ; :b ; :c ; 
+'b d:hide 
+'#5_d:words.last s:(evaluate) 
+```
+
+# Forget
+
+~~~
+:d:forget.a (a-) dup n:-zero? [ dup !Heap d:link fetch !Dictionary ] 
+  [ drop 'tried_to_d:forget_a_word_that_doesn't_exist. s:shout ] choose ; 
+:d:forget (s-) d:lookup d:forget.a ; 
+:f:reset (-|float:?-) f:depth [ f:drop ] times ; 
+:reset.nf (?-|float:?-) reset f:reset ; 
+:d:wipe (-) reset.nf '---wipe--- d:newer d:forget.a ; 
+~~~
+
+``` 
+:---wipe--- ; 
+:a ; :b ; :c ; nl 
+'#5_d:words.last s:(evaluate) 
+d:wipe nl 
+'#5_d:words.last s:(evaluate) nl 
+```