Don't lint redundant_field_names across macro boundaries

tests/ui/redundant_field_names.fixed

@@ -20,7 +20,7 @@ struct Person {
 }
 
 pub struct S {
-    v: String,
+    v: usize,
 }
 
 fn main() {
@@ -59,11 +59,22 @@ fn main() {
     let _ = RangeToInclusive { end };
 
     external! {
-        let v = String::new();
+        let v = 1;
         let _ = S {
             v: v
         };
     }
+
+    let v = 2;
+    macro_rules! internal {
+        ($i:ident) => {
+            let _ = S { v };
+            let _ = S { $i: v };
+            let _ = S { v: $i };
+            let _ = S { $i: $i };
+        };
+    }
+    internal!(v);
 }
 
 fn issue_3476() {

tests/ui/redundant_field_names.rs

@@ -20,7 +20,7 @@ struct Person {
 }
 
 pub struct S {
-    v: String,
+    v: usize,
 }
 
 fn main() {
@@ -59,11 +59,22 @@ fn main() {
     let _ = RangeToInclusive { end: end };
 
     external! {
-        let v = String::new();
+        let v = 1;
         let _ = S {
             v: v
         };
     }
+
+    let v = 2;
+    macro_rules! internal {
+        ($i:ident) => {
+            let _ = S { v: v };
+            let _ = S { $i: v };
+            let _ = S { v: $i };
+            let _ = S { $i: $i };
+        };
+    }
+    internal!(v);
 }
 
 fn issue_3476() {

tests/ui/redundant_field_names.stderr

@@ -44,10 +44,21 @@ LL |     let _ = RangeToInclusive { end: end };
    |                                ^^^^^^^^ help: replace it with: `end`
 
 error: redundant field names in struct initialization
-  --> tests/ui/redundant_field_names.rs:88:25
+  --> tests/ui/redundant_field_names.rs:71:25
+   |
+LL |             let _ = S { v: v };
+   |                         ^^^^ help: replace it with: `v`
+...
+LL |     internal!(v);
+   |     ------------ in this macro invocation
+   |
+   = note: this error originates in the macro `internal` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: redundant field names in struct initialization
+  --> tests/ui/redundant_field_names.rs:99:25
    |
 LL |     let _ = RangeFrom { start: start };
    |                         ^^^^^^^^^^^^ help: replace it with: `start`
 
-error: aborting due to 8 previous errors
+error: aborting due to 9 previous errors