From e2de04c1ccbab83adb610d1af59e04956a010f76 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Tue, 14 Apr 2026 12:45:30 +0300
Subject: [PATCH] parser: vfmt "breaks" invalid code with map of `[]u8` with
 `cap:` instead of giving error (fixes #24055)

---
 vlib/v/fmt/tests/maps_expected.vv            |  4 ----
 vlib/v/fmt/tests/maps_input.vv               |  6 +-----
 vlib/v/parser/map_init_fmt_regression_test.v | 21 ++++++++++++++++++++
 vlib/v/parser/parser.v                       |  5 -----
 4 files changed, 22 insertions(+), 14 deletions(-)
 create mode 100644 vlib/v/parser/map_init_fmt_regression_test.v

diff --git a/vlib/v/fmt/tests/maps_expected.vv b/vlib/v/fmt/tests/maps_expected.vv
index 78450b5f5..97ed7fad7 100644
--- a/vlib/v/fmt/tests/maps_expected.vv
+++ b/vlib/v/fmt/tests/maps_expected.vv
@@ -15,10 +15,6 @@ numbers := {
 
 explicit_init := map[string]string{}
 
-explicit_init_with_value := {
-	'abc': 0
-}
-
 headers := http.new_header_from_map({
 	.content_type:  'application/json'
 	.authorization: 'Bearer abcdef'
diff --git a/vlib/v/fmt/tests/maps_input.vv b/vlib/v/fmt/tests/maps_input.vv
index 549d0a376..f21c0d7f4 100644
--- a/vlib/v/fmt/tests/maps_input.vv
+++ b/vlib/v/fmt/tests/maps_input.vv
@@ -17,10 +17,6 @@ numbers := {
 
 explicit_init := map[string]string{}
 
-explicit_init_with_value := map[string]int{
-	'abc': 0
-}
-
 headers := http.new_header_from_map({
 .content_type: 'application/json',
   .authorization: 'Bearer abcdef'
@@ -52,4 +48,4 @@ utf8_keys := {
 	'В начале':                                                       'В начале'
 	'最初有道':                                                '最初有道'
 	'לפניכם':                                                         'לפניכם'
-}
\ No newline at end of file
+}
diff --git a/vlib/v/parser/map_init_fmt_regression_test.v b/vlib/v/parser/map_init_fmt_regression_test.v
new file mode 100644
index 000000000..9bedee7a9
--- /dev/null
+++ b/vlib/v/parser/map_init_fmt_regression_test.v
@@ -0,0 +1,21 @@
+import v.ast
+import v.parser
+import v.pref
+
+fn test_typed_map_init_is_rejected_in_fmt_mode() {
+	source_text := 'module main
+
+const c_cap = 10
+
+fn main() {
+	_ := map[string][]u8{cap: c_cap}
+}
+'
+	mut table := ast.new_table()
+	prefs := &pref.Preferences{
+		is_fmt:      true
+		output_mode: .silent
+	}
+	prog := parser.parse_text(source_text, '', mut table, .skip_comments, prefs)
+	assert prog.errors.any(it.message == '`}` expected; explicit `map` initialization does not support parameters')
+}
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index 5550c2197..fc96616db 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -1597,11 +1597,6 @@ fn (mut p Parser) name_expr() ast.Expr {
 				pos = pos.extend(p.tok.pos())
 				p.next()
 			} else {
-				if p.pref.is_fmt {
-					map_init := p.map_init()
-					p.check(.rcbr)
-					return map_init
-				}
 				p.error('`}` expected; explicit `map` initialization does not support parameters')
 			}
 		}
-- 
2.39.5