default to false if attr is not present on rule

nikhilm · nikhilm · commit cfddfb11aa75 · 2021-03-30T18:09:13.000-07:00
diff --git a/rust/private/rustc.bzl b/rust/private/rustc.bzl
@@ -57,7 +57,7 @@ ErrorFormatInfo = provider(
 )
 
 def _use_worker(ctx):
-    return ctx.attr._use_worker[BuildSettingInfo].value
+    return hasattr(ctx.attr, "_use_worker") and ctx.attr._use_worker[BuildSettingInfo].value
 
 def _get_rustc_env(ctx, toolchain):
     """Gathers rustc environment variables

Original file line number	Diff line number	Diff line change
`@@ -57,7 +57,7 @@ ErrorFormatInfo = provider(`
`57`	`57`	`)`
`58`	`58`
`59`	`59`	`def _use_worker(ctx):`
`60`		`- return ctx.attr._use_worker[BuildSettingInfo].value`
	`60`	`+ return hasattr(ctx.attr, "_use_worker") and ctx.attr._use_worker[BuildSettingInfo].value`
`61`	`61`
`62`	`62`	`def _get_rustc_env(ctx, toolchain):`
`63`	`63`	`"""Gathers rustc environment variables`