Make '=..'/2 work according to spec. Introduce types.c for functions which tells us something about term types. Should be used a lot more instead of explicitly looking into terms->tag everywhere

1 files changed, 9 insertions, 1 deletions

diff --git a/fns.h b/fns.h
index 7255166..d548d6e 100644
--- a/fns.h
+++ b/fns.h
@@ -63,4 +63,12 @@ void writeterm(Term *, Term *, Term *);
 /* module.c */
 void initmodules(void);
 Module *parsemodule(char *);
-Module *getmodule(Rune *);
\ No newline at end of file
+Module *getmodule(Rune *);
+
+/* types.c */
+int islist(Term *);
+int ispartiallist(Term *t);
+int isemptylist(Term *);
+int isnonemptylist(Term *);
+Term *listhead(Term *);
+Term *listtail(Term *);