Fixes

build.gradle

@@ -151,7 +151,7 @@ tasks.register('yarnCommon', EnigmaTask) {
 	mappings = mappingsDir
 }
 
-tasks.register('checkMappings') {
+def checkPackages = tasks.register('checkPackages') {
 	group = buildMappingGroup
 	inputs.dir mappingsDir
 	inputs.file mapIntermediaryJar.output
@@ -552,11 +552,12 @@ javadocLint {
 	mappingDirectory = file("mappings")
 }
 
-def checkDuplicates = tasks.register("checkDuplicateNames", CheckMappingsTask) {
-	input = mergeV2.outputFile
+def checkMappings = tasks.register("checkMappings", CheckMappingsTask) {
+	input = mergeV2.output
 }
 
-check.dependsOn checkDuplicates
+check.dependsOn checkPackages
+check.dependsOn checkMappings
 check.dependsOn javadocLint
 
 publishing {

filament/src/main/java/net/fabricmc/filament/task/mappingio/CheckMappingsTask.java

@@ -34,6 +34,7 @@ public abstract class CheckMappingsTask extends FilamentTask implements WithFile
 		for (MappingTree.ClassMapping classMapping : tree.getClasses()) {
 			method: for (MappingTree.MethodMapping method : classMapping.getMethods()) {
 				Set<String> names = new HashSet<>();
+
 				for (int id = minNamespaceId; id < maxNamespaceId; id++) {
 					String name = method.getName(id);