From af9234996fb53a4e7c0ec404d8dd275df17f1ccd Mon Sep 17 00:00:00 2001
From: mark
Date: Thu, 16 Feb 2012 17:09:21 +0000
Subject: First version of HOL Light tactic recording. See INSTRUCTIONS and
 LIMITATIONS files for more details. Currently works for flattening
 "packaged-up" tactic proofs into g/e commands. Won't work for most proofs
 because most tactics/thms haven't been promoted. Support for exporting proof
 graph as a series of goal pairs. Support for displaying extra information to
 be intercepter by PG for Prooftree.

---
 hol-light/TacticRecording/LIMITATIONS | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 hol-light/TacticRecording/LIMITATIONS

(limited to 'hol-light/TacticRecording/LIMITATIONS')

diff --git a/hol-light/TacticRecording/LIMITATIONS b/hol-light/TacticRecording/LIMITATIONS
new file mode 100644
index 00000000..56537d47
--- /dev/null
+++ b/hol-light/TacticRecording/LIMITATIONS
@@ -0,0 +1,18 @@
+ML objects that get recorded need to be promoted
+- and the promoted subgoal package commands don't work for unpromoted ML objects
+- implementor needs to write promotion functions for each type shape
+- implementor needs to apply these promotion functions to lots of tactics/thms
+- user needs to promote their own stuff, e.g. their own rules/thms
+
+Tactic proofs with embedded arbitrary ML are problematic
+- sometimes this can still get recorded, and if so then exported ML will work
+- but exported ML is unlikely to faithfully reproduce original ML text
+
+Limitations in HOL Light's pretty printer for HOL terms
+- it outputs ambiguous expressions without type annotations
+- this is used by my ML exporter
+
+However, in practice the appraoch works well
+- the same old pool of 100 tactics, 100 rules, 1000 theorems get used
+- and any promotion that needs doing is easy anyway
+- hand tweaks are occasionally required for aribitrary ML and type annotations
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