[manual_let_else]: only omit block if span is from same ctxt

Author: y21

clippy_lints/src/manual_let_else.rs

@@ -136,9 +136,9 @@ fn emit_manual_let_else(
             // for this to be machine applicable.
             let mut app = Applicability::HasPlaceholders;
             let (sn_expr, _) = snippet_with_context(cx, expr.span, span.ctxt(), "", &mut app);
-            let (sn_else, _) = snippet_with_context(cx, else_body.span, span.ctxt(), "", &mut app);
+            let (sn_else, else_is_mac_call) = snippet_with_context(cx, else_body.span, span.ctxt(), "", &mut app);
 
-            let else_bl = if matches!(else_body.kind, ExprKind::Block(..)) {
+            let else_bl = if matches!(else_body.kind, ExprKind::Block(..)) && !else_is_mac_call {
                 sn_else.into_owned()
             } else {
                 format!("{{ {sn_else} }}")

tests/ui/manual_let_else_match.fixed

@@ -133,3 +133,7 @@ fn not_fire() {
         [data @ .., 0, 0, 0, 0] | [data @ .., 0, 0] | [data @ ..] => data,
     };
 }
+
+fn issue11579() {
+    let Some(msg) = Some("hi") else { unreachable!("can't happen") };
+}

tests/ui/manual_let_else_match.rs

@@ -170,3 +170,11 @@ fn not_fire() {
         [data @ .., 0, 0, 0, 0] | [data @ .., 0, 0] | [data @ ..] => data,
     };
 }
+
+fn issue11579() {
+    let msg = match Some("hi") {
+        //~^ ERROR: this could be rewritten as `let...else`
+        Some(m) => m,
+        _ => unreachable!("can't happen"),
+    };
+}

tests/ui/manual_let_else_match.stderr

@@ -92,5 +92,15 @@ LL | |         _ => return,
 LL | |     };
    | |______^ help: consider writing: `let ([data @ .., 0, 0, 0, 0] | [data @ .., 0, 0] | [data @ .., 0]) = data.as_slice() else { return };`
 
-error: aborting due to 9 previous errors
+error: this could be rewritten as `let...else`
+  --> $DIR/manual_let_else_match.rs:175:5
+   |
+LL | /     let msg = match Some("hi") {
+LL | |
+LL | |         Some(m) => m,
+LL | |         _ => unreachable!("can't happen"),
+LL | |     };
+   | |______^ help: consider writing: `let Some(msg) = Some("hi") else { unreachable!("can't happen") };`
+
+error: aborting due to 10 previous errors