Fallout from removing TupField

src/chains.rs

@@ -393,7 +393,6 @@ fn pop_expr_chain(expr: &ast::Expr, context: &RewriteContext) -> Option<ast::Exp
         ast::ExprKind::MethodCall(_, ref expressions) => {
             Some(convert_try(&expressions[0], context))
         }
-        ast::ExprKind::TupField(ref subexpr, _)
         | ast::ExprKind::Field(ref subexpr, _)
         | ast::ExprKind::Try(ref subexpr) => Some(convert_try(subexpr, context)),
         _ => None,
@@ -440,19 +439,28 @@ fn rewrite_chain_subexpr(
             };
             rewrite_method_call(segment.ident, types, expressions, span, context, shape)
         }
-        ast::ExprKind::Field(_, ref field) => rewrite_element(format!(".{}", field.name)),
+        ast::ExprKind::Field(ref nested, ref field) => {
-        ast::ExprKind::TupField(ref expr, ref field) => {
+            let space = if is_tup_field_access(expr) && is_tup_field_access(nested) {
-            let space = match expr.node {
+                " "
-                ast::ExprKind::TupField(..) => " ",
+            } else {
-                _ => "",
+                ""
             };
-            rewrite_element(format!("{}.{}", space, field.node))
+            rewrite_element(format!("{}.{}", space, field.name))
         }
         ast::ExprKind::Try(_) => rewrite_element(String::from("?")),
         _ => unreachable!(),
     }
 }
 
+fn is_tup_field_access(expr: &ast::Expr) -> bool {
+    match expr.node {
+        ast::ExprKind::Field(_, ref field) => {
+            field.name.to_string().chars().all(|c| c.is_digit(10))
+        }
+        _ => false,
+    }
+}
+
 // Determines if we can continue formatting a given expression on the same line.
 fn is_continuable(expr: &ast::Expr) -> bool {
     match expr.node {

src/expr.rs

@@ -178,7 +178,6 @@ pub fn format_expr(
         }
         ast::ExprKind::Try(..)
         | ast::ExprKind::Field(..)
-        | ast::ExprKind::TupField(..)
         | ast::ExprKind::MethodCall(..) => rewrite_chain(expr, context, shape),
         ast::ExprKind::Mac(ref mac) => {
             rewrite_macro(mac, None, context, shape, MacroPosition::Expression).or_else(|| {
@@ -1349,7 +1348,6 @@ fn is_simple_expr(expr: &ast::Expr) -> bool {
         | ast::ExprKind::Cast(ref expr, _)
         | ast::ExprKind::Field(ref expr, _)
         | ast::ExprKind::Try(ref expr)
-        | ast::ExprKind::TupField(ref expr, _)
         | ast::ExprKind::Unary(_, ref expr) => is_simple_expr(expr),
         ast::ExprKind::Index(ref lhs, ref rhs) | ast::ExprKind::Repeat(ref lhs, ref rhs) => {
             is_simple_expr(lhs) && is_simple_expr(rhs)

src/utils.rs

@@ -365,7 +365,6 @@ pub fn left_most_sub_expr(e: &ast::Expr) -> &ast::Expr {
         | ast::ExprKind::Assign(ref e, _)
         | ast::ExprKind::AssignOp(_, ref e, _)
         | ast::ExprKind::Field(ref e, _)
-        | ast::ExprKind::TupField(ref e, _)
         | ast::ExprKind::Index(ref e, _)
         | ast::ExprKind::Range(Some(ref e), _, _)
         | ast::ExprKind::Try(ref e) => left_most_sub_expr(e),