patterns: Fix default coercion error on transition_dep

Summary: From previous diff

Reviewed By: IanChilds

Differential Revision: D69713862

fbshipit-source-id: 742a2afa171313172fc5258a12a434d54904809e

Author: JakobDegen

app/buck2_interpreter_for_build/src/attrs/attrs_global.rs

@@ -217,16 +217,11 @@ fn attr_module(registry: &mut GlobalsBuilder) {
 
         let coerced_default = match default {
             None => None,
-            Some(default) => {
-                match coercer.coerce(
-                    AttrIsConfigurable::Yes,
-                    &attr_coercion_context_for_bzl(eval)?,
-                    default,
-                ) {
-                    Ok(coerced_default) => Some(coerced_default),
-                    Err(_) => return Err(ValueError::IncorrectParameterType.into()),
-                }
-            }
+            Some(default) => Some(coercer.coerce(
+                AttrIsConfigurable::Yes,
+                &attr_coercion_context_for_bzl(eval)?,
+                default,
+            )?),
         };
 
         Ok(StarlarkAttribute::new(Attribute::new(
@@ -262,16 +257,11 @@ fn attr_module(registry: &mut GlobalsBuilder) {
 
         let coerced_default = match default {
             None => None,
-            Some(default) => {
-                match coercer.coerce(
-                    AttrIsConfigurable::Yes,
-                    &attr_coercion_context_for_bzl(eval)?,
-                    default,
-                ) {
-                    Ok(coerced_default) => Some(coerced_default),
-                    Err(_) => return Err(ValueError::IncorrectParameterType.into()),
-                }
-            }
+            Some(default) => Some(coercer.coerce(
+                AttrIsConfigurable::Yes,
+                &attr_coercion_context_for_bzl(eval)?,
+                default,
+            )?),
         };
 
         Ok(StarlarkAttribute::new(Attribute::new(

tests/core/interpreter/test_attr_default_coercion_data/golden/default_not_a_label.golden.stderr

@@ -12,10 +12,12 @@ Caused by:
     2: Traceback (most recent call last):
          * error_rule.bzl:22, in <module>
              "someattr": attrs.transition_dep(default = "notaproperlabel", cfg = _transiti...
-       error: Type of parameters mismatch
+       
+       error: Error coercing "notaproperlabel"
          --> error_rule.bzl:22:21
           |
        22 |         "someattr": attrs.transition_dep(default = "notaproperlabel", cfg = _transition),
           |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
           |
-       
+    3: Invalid target pattern `notaproperlabel` is not allowed
+    4: Expected a `:`, a trailing `/...` or the literal `...`.