From 1b99e08a9ed070adfb5bc1f6e62449ce57520dab Mon Sep 17 00:00:00 2001
From: jakubtomsu <66876057+jakubtomsu@users.noreply.github.com>
Date: Thu, 16 Apr 2026 17:04:34 +0200
Subject: [PATCH] omit value when formatting map[T]struct{}

---
 core/fmt/fmt.odin | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/core/fmt/fmt.odin b/core/fmt/fmt.odin
index 4ecb19c21..3118e7e5e 100644
--- a/core/fmt/fmt.odin
+++ b/core/fmt/fmt.odin
@@ -3132,12 +3132,14 @@ fmt_map :: proc(fi: ^Info, v: any, info: runtime.Type_Info_Map, verb: rune) {
 				value := runtime.map_cell_index_dynamic(vs, info.map_info.vs, bucket_index)
 
 				fmt_arg(&Info{writer = fi.writer}, any{rawptr(key), info.key.id}, verb)
-				if hash {
-					io.write_string(fi.writer, " = ", &fi.n)
-				} else {
-					io.write_string(fi.writer, "=", &fi.n)
+				if info.value.size > 0 {
+					if hash {
+						io.write_string(fi.writer, " = ", &fi.n)
+					} else {
+						io.write_string(fi.writer, "=", &fi.n)
+					}
+					fmt_arg(fi, any{rawptr(value), info.value.id}, verb)
 				}
-				fmt_arg(fi, any{rawptr(value), info.value.id}, verb)
 
 				if do_trailing_comma { io.write_string(fi.writer, ",\n", &fi.n) }
 			}