Merge pull request #248 from thomasmulvaney/add-set-pred

added set predicate

Author: halgari

pixie/stdlib.pxi

@@ -801,6 +801,7 @@ If further arguments are passed, invokes the method named by symbol, passing the
 (defn keyword? [v] (instance? Keyword v))
 
 (defn list? [v] (instance? PersistentList v))
+(defn set? [v] (instance? PersistentHashSet v))
 (defn map? [v] (satisfies? IMap v))
 (defn fn? [v] (satisfies? IFn v))
 

pixie/vm/stdlib.py

@@ -420,7 +420,6 @@ def _load_file(filename, compile=False):
     import pixie.vm.reader as reader
     import pixie.vm.libs.pxic.writer as pxic_writer
     import os.path as path
-    from pixie.vm.persistent_vector import EMPTY as EMPTY_VECTOR
     import os
 
 
@@ -826,4 +825,4 @@ def _set_current_var_frames(self, frames):
     """(-set-current-var-frames frames)
        Sets the current var frames. Frames should be a cons list of hashmaps containing mappings of vars to dynamic
        values. Setting this value to anything but this data format will cause undefined errors."""
-    code._dynamic_vars.set_current_frames(frames)
+    code._dynamic_vars.set_current_frames(frames)