fix broken symlink issue on windows

news/broke-sym.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Made ``$PATH`` searching more robust to broken symlinks on Windows.
+
+**Security:**
+
+* <news item>

xonsh/tools.py

@@ -790,7 +790,11 @@ def _executables_in_windows(path):
                     yield fname
     else:
         for x in scandir(path):
-            if x.is_file():
+            try:
+                is_file = x.is_file()
+            except OSError:
+                continue
+            if is_file:
                 fname = x.name
             else:
                 continue