Remove unused symbol constants
These were only used by IO predicates removed earlier
by commit d56882fa79df9e9b47a1906b2a3662fe6d0727b5.
Change-Id: I39b051d0fb744a5c1bd3122eea0f26961efa8531
diff --git a/src/lang/Prolog.java b/src/lang/Prolog.java
index d64412f..25ced4e 100644
--- a/src/lang/Prolog.java
+++ b/src/lang/Prolog.java
@@ -89,16 +89,6 @@
/** Holds an atom <code>[]<code> (empty list). */
public static final SymbolTerm Nil = SymbolTerm.intern("[]");
- /* Some symbols for stream options */
- static final SymbolTerm SYM_MODE_1 = SymbolTerm.intern("mode", 1);
- static final SymbolTerm SYM_ALIAS_1 = SymbolTerm.intern("alias", 1);
- static final SymbolTerm SYM_TYPE_1 = SymbolTerm.intern("type", 1);
- static final SymbolTerm SYM_READ = SymbolTerm.intern("read");
- static final SymbolTerm SYM_APPEND = SymbolTerm.intern("append");
- static final SymbolTerm SYM_INPUT = SymbolTerm.intern("input");
- static final SymbolTerm SYM_OUTPUT = SymbolTerm.intern("output");
- static final SymbolTerm SYM_TEXT = SymbolTerm.intern("text");
-
public static enum Feature {
/** Access to the local filesystem and console. */
IO,
