Fix a temporary-file crash

NEWS.rst

@@ -12,6 +12,11 @@ New Features
 * Format strings with embedded Hy code (e.g., `f"The sum is {(+ x y)}"`)
   are now supported, even on Pythons earlier than 3.6.
 
+Bug Fixes
+------------------------------
+* Fixed a crash caused by errors creating temp files during bytecode
+  compilation
+
 0.16.0
 ==============================
 

hy/importer.py

@@ -467,9 +467,10 @@ else:
         if cfile is None:
             cfile = cache_from_source(filename)
 
+        f = None
+        try:
             f = tempfile.NamedTemporaryFile('wb', dir=os.path.split(cfile)[0],
                                             delete=False)
-        try:
             f.write('\0\0\0\0')
             f.write(struct.pack('<I', timestamp))
             f.write(marshal.dumps(codeobject))
@@ -489,6 +490,7 @@ else:
             os.rename(f.name, cfile)
         except OSError:
             try:
+                if f is not None:
                     os.unlink(f.name)
             except OSError:
                 pass