From 3c1c0c09e68420c813d6258b90ff96641dbd1151 Mon Sep 17 00:00:00 2001
From: Fabian Meumertzheim <fabian@meumertzhe.im>
Date: Mon, 27 Mar 2023 08:30:34 -0700
Subject: [PATCH] Add suggestions to invalid tag class errors

Closes #17888.

PiperOrigin-RevId: 519729739
Change-Id: I0ae8b18acd1a88de4da40b6883cf24c5ce6586bb
---
 .../build/lib/bazel/bzlmod/StarlarkBazelModule.java         | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/google/devtools/build/lib/bazel/bzlmod/StarlarkBazelModule.java b/src/main/java/com/google/devtools/build/lib/bazel/bzlmod/StarlarkBazelModule.java
index 934314f65b46d7..3f28dbe288bc34 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/bzlmod/StarlarkBazelModule.java
+++ b/src/main/java/com/google/devtools/build/lib/bazel/bzlmod/StarlarkBazelModule.java
@@ -34,6 +34,7 @@
 import net.starlark.java.eval.StarlarkList;
 import net.starlark.java.eval.StarlarkValue;
 import net.starlark.java.eval.Structure;
+import net.starlark.java.spelling.SpellChecker;
 
 /** A Starlark object representing a Bazel module in the external dependency graph. */
 @StarlarkBuiltin(
@@ -118,10 +119,11 @@ public static StarlarkBazelModule create(
         throw ExternalDepsException.withMessage(
             Code.BAD_MODULE,
             "The module extension defined at %s does not have a tag class named %s, but its use is"
-                + " attempted at %s",
+                + " attempted at %s%s",
             extension.getLocation(),
             tag.getTagName(),
-            tag.getLocation());
+            tag.getLocation(),
+            SpellChecker.didYouMean(tag.getTagName(), extension.getTagClasses().keySet()));
       }
 
       // Now we need to type-check the attribute values and convert them into "build language types"