zig fmt: rewrite byteOffsetOf to offsetOf

Author: Vexu

lib/std/zig/parser_test.zig

@@ -107,6 +107,21 @@ test "zig fmt: rewrite suspend without block expression" {
     );
 }
 
+// TODO Remove this after zig 0.9.0 is released.
+test "zig fmt: rewrite @byteOffsetOf to @offsetOf" {
+    try testTransform(
+        \\fn foo() void {
+        \\    @byteOffsetOf(Foo, "bar");
+        \\}
+        \\
+    ,
+        \\fn foo() void {
+        \\    @offsetOf(Foo, "bar");
+        \\}
+        \\
+    );
+}
+
 test "zig fmt: simple top level comptime block" {
     try testCanonical(
         \\// line comment

lib/std/zig/render.zig

@@ -1211,7 +1211,12 @@ fn renderBuiltinCall(
 ) Error!void {
     const token_tags = tree.tokens.items(.tag);
 
-    try renderToken(ais, tree, builtin_token, .none); // @name
+    const builtin_name = tokenSliceForRender(tree, builtin_token);
+    if (mem.eql(u8, builtin_name, "@byteOffsetOf")) {
+        try ais.writer().writeAll("@offsetOf");
+    } else {
+        try renderToken(ais, tree, builtin_token, .none); // @name
+    }
 
     if (params.len == 0) {
         try renderToken(ais, tree, builtin_token + 1, .none); // (