From bfe75d5c2cfce94b989431ddb2b186a0d877ffe9 Mon Sep 17 00:00:00 2001
From: gingerBill <gingerBill@users.noreply.github.com>
Date: Fri, 2 Jan 2026 10:19:23 +0000
Subject: [PATCH] Add boolean support for `raw_union_tag`

---
 core/fmt/fmt.odin | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/core/fmt/fmt.odin b/core/fmt/fmt.odin
index 72fe6fdf0..04211b8a9 100644
--- a/core/fmt/fmt.odin
+++ b/core/fmt/fmt.odin
@@ -2159,6 +2159,35 @@ __handle_raw_union_tag :: proc(fi: ^Info, v: any, the_verb: rune, info: runtime.
 				}
 			}
 		}
+
+	case reflect.Type_Info_Boolean:
+		tag_value := reflect.as_bool(tag) or_break
+
+		for tag, index in info.tags[:info.field_count] {
+			rut_list := reflect.struct_tag_lookup(reflect.Struct_Tag(tag), "raw_union_tag") or_continue
+
+			for rut in strings.split_iterator(&rut_list, ",") {
+				head_tag, match, tail_name := strings.partition(string(rut), "=")
+				if head_tag != tag_name || match != "=" {
+					continue
+				}
+
+				// just ignore the `A.` prefix for `A.B` stuff entirely
+				if _, _, try_tail_name := strings.partition(string(rut), "."); try_tail_name != "" {
+					tail_name = try_tail_name
+				}
+
+				tail_value := strconv.parse_bool(tail_name) or_continue
+
+				if tail_value == tag_value {
+					io.write_string(fi.writer, "#raw_union(.", &fi.n)
+					io.write_string(fi.writer, "true" if tag_value else "false", &fi.n)
+					io.write_string(fi.writer, ") ", &fi.n)
+					fmt_arg(fi, any{v.data, info.types[index].id}, the_verb)
+					return true
+				}
+			}
+		}
 	}
 
 	return false