test formatting

crates/hir_def/src/macro_expansion_tests.rs

@@ -128,6 +128,7 @@ fn pretty_print_macro_expansion(expn: SyntaxNode) -> String {
             (T![>], _) if curr_kind.is_keyword() => " ",
             (T![->], _) | (_, T![->]) => " ",
             (T![&&], _) | (_, T![&&]) => " ",
+            (T![,], _) => " ",
             _ => "",
         };
 

crates/hir_def/src/macro_expansion_tests/mbe.rs

@@ -835,7 +835,7 @@ macro_rules! m {
     ($p:pat) => { fn foo() { let $p; } }
 }
 fn foo() {
-    let(a,b);
+    let(a, b);
 }
 "#]],
     );