Improve error message for --incompatible_string_join_requires_strings

Fixes bazelbuild#8507 Closes bazelbuild#8519. Change-Id: Ia2967b8765a6f47094dd382a8c963ec01132066c PiperOrigin-RevId: 250705179
buchgr · May 30, 2019 · 089e017 · 089e017
1 parent 4aa1d1a
commit 089e017
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/StringModule.java b/src/main/java/com/google/devtools/build/lib/syntax/StringModule.java
@@ -115,7 +115,10 @@ public String join(String self, SkylarkList<?> elements, Location loc, Environme
         if (!(item instanceof String)) {
           throw new EvalException(
               loc,
-              "sequence element must be a string (got '" + EvalUtils.getDataTypeName(item) + "')");
+              "sequence element must be a string (got '"
+                  + EvalUtils.getDataTypeName(item)
+                  + "'). See https://github.com/bazelbuild/bazel/issues/7802 for information about "
+                  + "--incompatible_string_join_requires_strings.");
         }
       }
     }