chore: improve error msg

aspect-build · Oct 3, 2024 · c44466f · c44466f
1 parent 95ad08c
commit c44466f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/py/defs.bzl b/py/defs.bzl
@@ -23,7 +23,7 @@ resolutions = _resolutions
 
 def _py_binary_or_test(name, rule, srcs, main, deps = [], resolutions = {}, **kwargs):
     if type(main) not in ["string", "Label"]:
-        fail("main must be a Label or a string")
+        fail("main must be a Label or a string, not {}".format(type(main)))
 
     # Compatibility with rules_python, see docs in py_executable.bzl
     main_target = "_{}.find_main".format(name)