Macro matchers inconsistently having whitespace removed after ,

[sgrif]

It seems that rustfmt is sometimes trying to remove whitespace after , when it appears in macro matchers, but not always. Diff from Diesel:

--- a/diesel/src/expression/operators.rs
+++ b/diesel/src/expression/operators.rs
@@ -106,30 +106,18 @@ macro_rules! __diesel_operator_body {
 #[macro_export]
 #[doc(hidden)]
 macro_rules! __diesel_operator_to_sql {
-    (
-        notation = infix,
-        operator_expr = $op:expr,
-        field_exprs = ($left:expr, $right:expr),
-    ) => {
+    (notation = infix,operator_expr = $op:expr,field_exprs = ($left:expr, $right:expr),) => {
         $left;
         $op;
         $right;
     };

-    (
-        notation = postfix,
-        operator_expr = $op:expr,
-        field_exprs = ($expr:expr),
-    ) => {
+    (notation = postfix,operator_expr = $op:expr,field_exprs = ($expr:expr),) => {
         $expr;
         $op;
     };

-    (
-        notation = prefix,
-        operator_expr = $op:expr,
-        field_exprs = ($expr:expr),
-    ) => {
+    (notation = prefix,operator_expr = $op:expr,field_exprs = ($expr:expr),) => {
         $op;
         $expr;
     };
@@ -258,7 +246,7 @@ macro_rules! diesel_postfix_operator {
         diesel_postfix_operator!($name, $operator, $crate::sql_types::Bool);
     };

-    ($name:ident, $operator:expr, backend: $backend:ty) => {
+    ($name:ident, $operator:expr,backend: $backend:ty) => {
         diesel_postfix_operator!($name, $operator, $crate::sql_types::Bool, backend: $backend);
     };

@@ -275,7 +263,7 @@ macro_rules! diesel_postfix_operator {
         );
     };

-    ($name:ident, $operator:expr, $return_ty:ty, backend: $backend:ty) => {
+    ($name:ident, $operator:expr, $return_ty:ty,backend: $backend:ty) => {
         __diesel_operator_body!(
             notation = postfix,
             struct_name = $name,
@@ -303,7 +291,7 @@ macro_rules! diesel_prefix_operator {
         diesel_prefix_operator!($name, $operator, $crate::sql_types::Bool);
     };

-    ($name:ident, $operator:expr, backend: $backend:ty) => {
+    ($name:ident, $operator:expr,backend: $backend:ty) => {
         diesel_prefix_operator!($name, $operator, $crate::sql_types::Bool, backend: $backend);

--- a/diesel/src/macros/mod.rs
+++ b/diesel/src/macros/mod.rs
@@ -839,7 +839,7 @@ macro_rules! __diesel_table_impl {
 #[macro_export]
 #[doc(hidden)]
 macro_rules! __diesel_table_query_source_impl {
-    ($table_struct:ident, public, $table_name:expr) => {
+    ($table_struct:ident,public, $table_name:expr) => {
         impl QuerySource for $table_struct {
             type FromClause = Identifier<'static>;
             type DefaultSelection = <Self as Table>::AllColumns;
@@ -966,12 +966,13 @@ macro_rules! joinable_inner {
     };

     (
-        left_table_ty = $left_table_ty:ty,
-        right_table_ty = $right_table_ty:ty,
-        right_table_expr = $right_table_expr:expr,
-        foreign_key = $foreign_key:path,
-        primary_key_ty = $primary_key_ty:ty,
-        primary_key_expr = $primary_key_expr:expr,
+        left_table_ty =
+        $left_table_ty:ty,right_table_ty =
+        $right_table_ty:ty,right_table_expr =
+        $right_table_expr:expr,foreign_key =
+        $foreign_key:path,primary_key_ty =
+        $primary_key_ty:ty,primary_key_expr =
+        $primary_key_expr:expr,
     ) => {
         impl $crate::JoinTo<$right_table_ty> for $left_table_ty {
             type FromClause = $right_table_ty;