zig fmt: translate ??x to x.?

See #1023

Author: andrewrk

std/zig/render.zig

@@ -465,13 +465,23 @@ fn renderExpression(
                 ast.Node.PrefixOp.Op.BoolNot,
                 ast.Node.PrefixOp.Op.Negation,
                 ast.Node.PrefixOp.Op.NegationWrap,
-                ast.Node.PrefixOp.Op.UnwrapMaybe,
                 ast.Node.PrefixOp.Op.MaybeType,
                 ast.Node.PrefixOp.Op.AddressOf,
                 => {
                     try renderToken(tree, stream, prefix_op_node.op_token, indent, start_col, Space.None);
                 },
 
+                ast.Node.PrefixOp.Op.UnwrapMaybe => {
+                    try renderExpression(allocator, stream, tree, indent, start_col, prefix_op_node.rhs, Space.None);
+                    try stream.write(".?");
+                    switch (space) {
+                        Space.Space => try stream.writeByte(' '),
+                        Space.Comma => try stream.write(",\n"),
+                        else => {},
+                    }
+                    return;
+                },
+
                 ast.Node.PrefixOp.Op.Try,
                 ast.Node.PrefixOp.Op.Await,
                 ast.Node.PrefixOp.Op.Cancel,