Cleaner code for unsep literals

Author: tesuji

clippy_lints/src/misc_early.rs

@@ -390,6 +390,10 @@ impl EarlyLintPass for MiscEarlyLints {
 
 impl MiscEarlyLints {
     fn check_lit(self, cx: &EarlyContext<'_>, lit: &Lit) {
+        if in_external_macro(cx.sess(), lit.span) {
+            return;
+        }
+
         if let LitKind::Int(value, lit_int_type) = lit.node {
             if let Some(src) = snippet_opt(cx, lit.span) {
                 let suffix = match lit_int_type {
@@ -440,7 +444,7 @@ impl MiscEarlyLints {
                         |db| {
                             db.span_suggestion(
                                 lit.span,
-                                "if you mean to use a decimal constant, remove the `0` to remove confusion",
+                                "if you mean to use a decimal constant, remove the `0` to avoid confusion",
                                 src.trim_start_matches(|c| c == '_' || c == '0').to_string(),
                                 Applicability::MaybeIncorrect,
                             );