find imported macros for sugg

Author: DevinR528

clippy_lints/src/macro_use.rs

@@ -36,8 +36,10 @@ impl EarlyLintPass for MacroUseImport {
                 .iter()
                 .find(|attr| attr.ident().map(|s| s.to_string()) == Some("macro_use".to_string()));
             then {
+                let import_path = snippet(ecx, use_tree.span, "_");
+                let mac_names = find_used_macros(ecx, &import_path);
                 let msg = "`macro_use` attributes are no longer needed in the Rust 2018 edition";
-                let help = format!("use {}::<macro name>", snippet(ecx, use_tree.span, "_"));
+                let help = format!("use {}::<macro name>", import_path);
                 span_lint_and_sugg(
                     ecx,
                     MACRO_USE_IMPORT,
@@ -51,3 +53,9 @@ impl EarlyLintPass for MacroUseImport {
         }
     }
 }
+
+fn find_used_macros(ecx: &EarlyContext<'_>, path: &str) {
+    for it in ecx.krate.module.items.iter() {
+        println!("{:#?}", it);
+    }
+}