ci: enable vfmt check

.github/workflows/ci.yml

@@ -51,9 +51,9 @@ jobs:
         ./v vet vlib/v/gen/cgen.v
         ./v vet vlib/v/checker
         ./v vet vlib/sqlite
-#    - name: v fmt
-#      run: |
-#        ./v fmt -verify vlib/v/checker/checker.v
+    - name: v fmt
+      run: |
+        ./v fmt -verify vlib/v/checker/checker.v
 #    - name: Test v binaries
 #      run: ./v -silent build-vbinaries
 

cmd/tools/vfmt.v

@@ -204,6 +204,7 @@ fn (foptions &FormatOptions) post_process_file(file, formatted_file_path string)
 		}
 		x := util.color_compare_files(diff_cmd, file, formatted_file_path)
 		if x.len != 0 {
+			println("$file is not vfmt'ed")
 			exit(1)
 		}
 		return