Added lazy sequences and parser combinators for same.

--- a/src/Pure/IsaMakefile	Thu Jan 08 08:14:00 2004 +0100
+++ b/src/Pure/IsaMakefile	Thu Jan 08 16:35:46 2004 +0100
@@ -23,37 +23,38 @@
 
 Pure: $(OUT)/Pure
 
-$(OUT)/Pure: General/ROOT.ML General/buffer.ML General/file.ML		\
-  General/graph.ML General/heap.ML General/history.ML			\
-  General/name_space.ML General/object.ML General/path.ML		\
-  General/position.ML General/pretty.ML General/scan.ML General/seq.ML	\
-  General/source.ML General/symbol.ML General/table.ML General/url.ML	\
-  General/xml.ML Isar/ROOT.ML Isar/antiquote.ML Isar/args.ML		\
-  Isar/attrib.ML Isar/auto_bind.ML Isar/calculation.ML			\
-  Isar/context_rules.ML Isar/induct_attrib.ML Isar/isar.ML		\
-  Isar/isar_cmd.ML Isar/isar_output.ML Isar/isar_syn.ML			\
-  Isar/isar_thy.ML Isar/locale.ML Isar/method.ML Isar/net_rules.ML	\
-  Isar/object_logic.ML Isar/obtain.ML Isar/outer_lex.ML			\
-  Isar/outer_parse.ML Isar/outer_syntax.ML Isar/proof.ML		\
-  Isar/proof_context.ML Isar/proof_data.ML Isar/proof_history.ML	\
-  Isar/rule_cases.ML Isar/session.ML Isar/skip_proof.ML			\
-  Isar/thy_header.ML Isar/toplevel.ML ML-Systems/mlworks.ML		\
-  ML-Systems/polyml-3.x.ML ML-Systems/polyml.ML				\
-  ML-Systems/smlnj-0.93.ML ML-Systems/smlnj-compiler.ML			\
-  ML-Systems/smlnj.ML Proof/ROOT.ML Proof/extraction.ML			\
-  Proof/proof_rewrite_rules.ML						\
-  Proof/proof_syntax.ML Proof/proofchecker.ML Proof/reconstruct.ML	\
-  ROOT.ML Syntax/ROOT.ML Syntax/ast.ML Syntax/lexicon.ML		\
-  Syntax/mixfix.ML Syntax/parser.ML Syntax/printer.ML			\
-  Syntax/syn_ext.ML Syntax/syn_trans.ML Syntax/syntax.ML		\
-  Syntax/token_trans.ML Syntax/type_ext.ML Thy/ROOT.ML Thy/html.ML	\
-  Thy/latex.ML Thy/present.ML Thy/thm_database.ML Thy/thm_deps.ML	\
-  Thy/thy_info.ML Thy/thy_load.ML Thy/thy_parse.ML Thy/thy_scan.ML	\
-  Thy/thy_syn.ML axclass.ML basis.ML codegen.ML context.ML display.ML	\
-  drule.ML envir.ML fact_index.ML goals.ML install_pp.ML library.ML	\
-  logic.ML meta_simplifier.ML net.ML pattern.ML proof_general.ML	\
-  proofterm.ML pure.ML pure_thy.ML search.ML sign.ML sorts.ML		\
-  tactic.ML tctical.ML term.ML theory.ML theory_data.ML thm.ML type.ML	\
+$(OUT)/Pure: General/ROOT.ML General/buffer.ML General/file.ML		  \
+  General/graph.ML General/heap.ML General/history.ML			  \
+  General/lazy_scan.ML General/lazy_seq.ML  General/name_space.ML	  \
+  General/object.ML General/path.ML General/position.ML General/pretty.ML \
+  General/scan.ML General/seq.ML General/source.ML General/susp.ML	  \
+  General/symbol.ML General/table.ML General/url.ML			  \
+  General/xml.ML Isar/ROOT.ML Isar/antiquote.ML Isar/args.ML		  \
+  Isar/attrib.ML Isar/auto_bind.ML Isar/calculation.ML			  \
+  Isar/context_rules.ML Isar/induct_attrib.ML Isar/isar.ML		  \
+  Isar/isar_cmd.ML Isar/isar_output.ML Isar/isar_syn.ML			  \
+  Isar/isar_thy.ML Isar/locale.ML Isar/method.ML Isar/net_rules.ML	  \
+  Isar/object_logic.ML Isar/obtain.ML Isar/outer_lex.ML			  \
+  Isar/outer_parse.ML Isar/outer_syntax.ML Isar/proof.ML		  \
+  Isar/proof_context.ML Isar/proof_data.ML Isar/proof_history.ML	  \
+  Isar/rule_cases.ML Isar/session.ML Isar/skip_proof.ML			  \
+  Isar/thy_header.ML Isar/toplevel.ML ML-Systems/mlworks.ML		  \
+  ML-Systems/polyml-3.x.ML ML-Systems/polyml.ML				  \
+  ML-Systems/smlnj-0.93.ML ML-Systems/smlnj-compiler.ML			  \
+  ML-Systems/smlnj.ML Proof/ROOT.ML Proof/extraction.ML			  \
+  Proof/proof_rewrite_rules.ML						  \
+  Proof/proof_syntax.ML Proof/proofchecker.ML Proof/reconstruct.ML	  \
+  ROOT.ML Syntax/ROOT.ML Syntax/ast.ML Syntax/lexicon.ML		  \
+  Syntax/mixfix.ML Syntax/parser.ML Syntax/printer.ML			  \
+  Syntax/syn_ext.ML Syntax/syn_trans.ML Syntax/syntax.ML		  \
+  Syntax/token_trans.ML Syntax/type_ext.ML Thy/ROOT.ML Thy/html.ML	  \
+  Thy/latex.ML Thy/present.ML Thy/thm_database.ML Thy/thm_deps.ML	  \
+  Thy/thy_info.ML Thy/thy_load.ML Thy/thy_parse.ML Thy/thy_scan.ML	  \
+  Thy/thy_syn.ML axclass.ML basis.ML codegen.ML context.ML display.ML	  \
+  drule.ML envir.ML fact_index.ML goals.ML install_pp.ML library.ML	  \
+  logic.ML meta_simplifier.ML net.ML pattern.ML proof_general.ML	  \
+  proofterm.ML pure.ML pure_thy.ML search.ML sign.ML sorts.ML		  \
+  tactic.ML tctical.ML term.ML theory.ML theory_data.ML thm.ML type.ML	  \
   type_infer.ML unify.ML
 	@./mk