Improve error messaging for AbstractAttributeMapper

RELNOTES: None.
PiperOrigin-RevId: 173315354

1 files changed, 3 insertions, 2 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/packages/AbstractAttributeMapper.java b/src/main/java/com/google/devtools/build/lib/packages/AbstractAttributeMapper.java
index 8b99d8182b..8763703df5 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/AbstractAttributeMapper.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/AbstractAttributeMapper.java
@@ -64,8 +64,9 @@ public abstract class AbstractAttributeMapper implements AttributeMap {
     } catch (ClassCastException e) {
       // getIndexWithTypeCheck checks the type is right, but unexpected configurable attributes
       // can still trigger cast exceptions.
-      throw new IllegalArgumentException("wrong type for attribute \"" + attributeName + "\" in "
-          + ruleClass + " rule " + ruleLabel, e);
+      throw new IllegalArgumentException(
+          String.format("wrong type for attribute \"%s\" in %s rule %s. type '%s', value '%s'",
+              attributeName, ruleClass, ruleLabel, type, value), e);
     }
   }