feat: v2 support for nested tuples w/o spaces

Author: calebcartwright

src/chains.rs

@@ -62,7 +62,7 @@ use rustc_ast::{ast, ptr};
 use rustc_span::{symbol, BytePos, Span};
 
 use crate::comment::{rewrite_comment, CharClasses, FullCodeCharKind, RichChar};
-use crate::config::IndentStyle;
+use crate::config::{IndentStyle, Version};
 use crate::expr::rewrite_call;
 use crate::lists::extract_pre_comment;
 use crate::macros::convert_try_mac;
@@ -200,7 +200,11 @@ impl Rewrite for ChainItem {
             ChainItemKind::StructField(ident) => format!(".{}", rewrite_ident(context, ident)),
             ChainItemKind::TupleField(ident, nested) => format!(
                 "{}.{}",
-                if nested { " " } else { "" },
+                if nested && context.config.version() == Version::One {
+                    " "
+                } else {
+                    ""
+                },
                 rewrite_ident(context, ident)
             ),
             ChainItemKind::Await => ".await".to_owned(),

tests/source/tuple.rs

@@ -50,3 +50,14 @@ fn issue1725() {
     bench_antialiased_lines!(bench_draw_antialiased_line_segment_diagonal, (10, 10), (450, 450));
     bench_antialiased_lines!(bench_draw_antialiased_line_segment_shallow, (10, 10), (450, 80));
 }
+
+fn issue_4355() {
+    let _ = ((1,),).0.0;
+}
+
+// https://github.com/rust-lang/rustfmt/issues/4410
+impl Drop for LockGuard {
+    fn drop(&mut self) {
+        LockMap::unlock(&self.0.0, &self.0.1);
+    }
+}

tests/source/tuple_v2.rs

@@ -0,0 +1,5 @@
+// rustfmt-version: Two
+
+fn issue_4355() {
+    let _ = ((1,),).0 .0;
+}

tests/target/tuple.rs

@@ -87,3 +87,14 @@ fn issue1725() {
         (450, 80)
     );
 }
+
+fn issue_4355() {
+    let _ = ((1,),).0 .0;
+}
+
+// https://github.com/rust-lang/rustfmt/issues/4410
+impl Drop for LockGuard {
+    fn drop(&mut self) {
+        LockMap::unlock(&self.0 .0, &self.0 .1);
+    }
+}

tests/target/tuple_v2.rs

@@ -0,0 +1,5 @@
+// rustfmt-version: Two
+
+fn issue_4355() {
+    let _ = ((1,),).0.0;
+}