Add more regression tests

Author: tesuji

clippy_lints/src/misc_early.rs

@@ -390,10 +390,6 @@ 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 {

tests/ui/unseparated_prefix_literals.fixed

@@ -3,6 +3,10 @@
 #![warn(clippy::unseparated_literal_suffix)]
 #![allow(dead_code)]
 
+macro_rules! lit_from_macro {
+    () => {42_usize};
+}
+
 fn main() {
     let _ok1 = 1234_i32;
     let _ok2 = 1234_isize;

tests/ui/unseparated_prefix_literals.rs

@@ -3,6 +3,10 @@
 #![warn(clippy::unseparated_literal_suffix)]
 #![allow(dead_code)]
 
+macro_rules! lit_from_macro {
+    () => {42usize};
+}
+
 fn main() {
     let _ok1 = 1234_i32;
     let _ok2 = 1234_isize;
@@ -17,4 +21,8 @@ fn main() {
     let _okf2 = 1_f32;
     let _failf1 = 1.5f32;
     let _failf2 = 1f32;
+
+    // Counter example
+    let _ = line!();
+    let _ = lit_from_macro!();
 }

tests/ui/unseparated_prefix_literals.stderr

@@ -1,43 +1,43 @@
 error: integer type suffix should be separated by an underscore
-  --> $DIR/unseparated_prefix_literals.rs:10:18
+  --> $DIR/unseparated_prefix_literals.rs:14:18
    |
 LL |     let _fail1 = 1234i32;
    |                  ^^^^^^^ help: add an underscore: `1234_i32`
    |
    = note: `-D clippy::unseparated-literal-suffix` implied by `-D warnings`
 
 error: integer type suffix should be separated by an underscore
-  --> $DIR/unseparated_prefix_literals.rs:11:18
+  --> $DIR/unseparated_prefix_literals.rs:15:18
    |
 LL |     let _fail2 = 1234u32;
    |                  ^^^^^^^ help: add an underscore: `1234_u32`
 
 error: integer type suffix should be separated by an underscore
-  --> $DIR/unseparated_prefix_literals.rs:12:18
+  --> $DIR/unseparated_prefix_literals.rs:16:18
    |
 LL |     let _fail3 = 1234isize;
    |                  ^^^^^^^^^ help: add an underscore: `1234_isize`
 
 error: integer type suffix should be separated by an underscore
-  --> $DIR/unseparated_prefix_literals.rs:13:18
+  --> $DIR/unseparated_prefix_literals.rs:17:18
    |
 LL |     let _fail4 = 1234usize;
    |                  ^^^^^^^^^ help: add an underscore: `1234_usize`
 
 error: integer type suffix should be separated by an underscore
-  --> $DIR/unseparated_prefix_literals.rs:14:18
+  --> $DIR/unseparated_prefix_literals.rs:18:18
    |
 LL |     let _fail5 = 0x123isize;
    |                  ^^^^^^^^^^ help: add an underscore: `0x123_isize`
 
 error: float type suffix should be separated by an underscore
-  --> $DIR/unseparated_prefix_literals.rs:18:19
+  --> $DIR/unseparated_prefix_literals.rs:22:19
    |
 LL |     let _failf1 = 1.5f32;
    |                   ^^^^^^ help: add an underscore: `1.5_f32`
 
 error: float type suffix should be separated by an underscore
-  --> $DIR/unseparated_prefix_literals.rs:19:19
+  --> $DIR/unseparated_prefix_literals.rs:23:19
    |
 LL |     let _failf2 = 1f32;
    |                   ^^^^ help: add an underscore: `1_f32`