Take into account a trailing comma on variant

src/items.rs

@@ -533,8 +533,8 @@ impl<'a> FmtVisitor<'a> {
         }
 
         let context = self.get_context();
-        let indent = self.block_indent;
-        let shape = self.shape();
+        // 1 = ','
+        let shape = self.shape().sub_width(1)?;
         let attrs_str = field.node.attrs.rewrite(&context, shape)?;
         let lo = field
             .node
@@ -544,19 +544,15 @@ impl<'a> FmtVisitor<'a> {
         let span = mk_sp(lo, field.span.lo());
 
         let variant_body = match field.node.data {
-            ast::VariantData::Tuple(..) | ast::VariantData::Struct(..) => {
-                // FIXME: Should limit the width, as we have a trailing comma
-                format_struct(
-                    &context,
-                    &StructParts::from_variant(field),
-                    indent,
-                    Some(one_line_width),
-                )?
-            }
+            ast::VariantData::Tuple(..) | ast::VariantData::Struct(..) => format_struct(
+                &context,
+                &StructParts::from_variant(field),
+                self.block_indent,
+                Some(one_line_width),
+            )?,
             ast::VariantData::Unit(..) => if let Some(ref expr) = field.node.disr_expr {
                 let lhs = format!("{} =", field.node.name);
-                // 1 = ','
-                rewrite_assign_rhs(&context, lhs, &**expr, shape.sub_width(1)?)?
+                rewrite_assign_rhs(&context, lhs, &**expr, shape)?
             } else {
                 field.node.name.to_string()
             },
@@ -1312,7 +1308,7 @@ fn format_tuple_struct(
         }
         result.push(')');
     } else {
-        let shape = Shape::indented(offset, context.config);
+        let shape = Shape::indented(offset, context.config).sub_width(1)?;
         let fields = &fields.iter().map(|field| field).collect::<Vec<_>>()[..];
         let one_line_width = context.config.width_heuristics().fn_call_width;
         result = rewrite_call_inner(context, &result, fields, span, shape, one_line_width, false)?;

tests/source/enum.rs

@@ -172,3 +172,11 @@ enum AnError {
     #[fail(display = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")]
     UnexpectedSingleToken { token: syn::Token },
 }
+
+// #2193
+enum WidthOf101 {
+    #[fail(display = ".....................................................")] Io(::std::io::Error),
+    #[fail(display = ".....................................................")] Ioo(::std::io::Error),
+    Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(::std::io::Error),
+    Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(::std::io::Error),
+}

tests/target/enum.rs

@@ -222,3 +222,14 @@ enum AnError {
     #[fail(display = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")]
     UnexpectedSingleToken { token: syn::Token },
 }
+
+// #2193
+enum WidthOf101 {
+    #[fail(display = ".....................................................")] Io(::std::io::Error),
+    #[fail(display = ".....................................................")]
+    Ioo(::std::io::Error),
+    Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(::std::io::Error),
+    Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx(
+        ::std::io::Error,
+    ),
+}