Set rustfmt-format_macro_matchers to false by default

cc #2543

Author: nrc

Configurations.md

@@ -1055,10 +1055,10 @@ Format the bodies of macros.
 
 ```rust
 macro_rules! foo {
-    ($a:ident : $b:ty) => {
+    ($a: ident : $b: ty) => {
         $a(42): $b;
     };
-    ($a:ident $b:ident $c:ident) => {
+    ($a: ident $b: ident $c: ident) => {
         $a = $b + $c;
     };
 }
@@ -1068,8 +1068,8 @@ macro_rules! foo {
 
 ```rust
 macro_rules! foo {
-    ($a:ident : $b:ty) => { $a(42): $b; };
-    ($a:ident $b:ident $c:ident) => { $a=$b+$c; };
+    ($a: ident : $b: ty) => { $a(42): $b; };
+    ($a: ident $b: ident $c: ident) => { $a=$b+$c; };
 }
 ```
 

src/config/mod.rs

@@ -53,7 +53,7 @@ create_config! {
     license_template_path: String, String::default(), false,
         "Beginning of file must match license template";
     format_strings: bool, false, false, "Format string literals where necessary";
-    format_macro_matchers: bool, true, false,
+    format_macro_matchers: bool, false, false,
         "Format the metavariable matching patterns in macros";
     format_macro_bodies: bool, true, false, "Format the bodies of macros";
 

tests/source/macro_rules.rs

@@ -1,3 +1,4 @@
+// rustfmt-format_macro_matchers: true
 
 macro_rules! m {
     () => ();

tests/source/macros.rs

@@ -1,4 +1,5 @@
 // rustfmt-normalize_comments: true
+// rustfmt-format_macro_matchers: true
 itemmacro!(this, is.now() .formatted(yay));
 
 itemmacro!(really, long.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbb() .is.formatted());

tests/target/macro_rules.rs

@@ -1,3 +1,5 @@
+// rustfmt-format_macro_matchers: true
+
 macro_rules! m {
     () => {};
     ($x:ident) => {};

tests/target/macros.rs

@@ -1,4 +1,5 @@
 // rustfmt-normalize_comments: true
+// rustfmt-format_macro_matchers: true
 itemmacro!(this, is.now().formatted(yay));
 
 itemmacro!(