fmt: fix comment handling on ending of struct decl (fix #23947) (#23948)

vlib/v/ast/ast.v

@@ -351,7 +351,6 @@ pub:
 	option_pos       token.Pos
 	pre_comments     []Comment
 	comments         []Comment
-	next_comments    []Comment
 	i                int
 	has_default_expr bool
 	has_prev_newline bool
@@ -365,6 +364,7 @@ pub:
 	is_deprecated    bool
 	is_embed         bool
 pub mut:
+	next_comments    []Comment
 	is_recursive     bool
 	is_part_of_union bool
 	container_typ    Type

vlib/v/fmt/tests/struct_end_comments_keep.vv

@@ -0,0 +1,11 @@
+module main
+
+pub struct CSDL_GamepadBinding {
+pub mut:
+	output_type u8
+	// TODO: BELONGS ABOVE // union {
+	//  SDL_GamepadButton button; struct {
+	//  SDL_GamepadAxis axis; int axis_min; int axis_max; } axis; } output
+}
+
+pub type GamepadBinding = CSDL_GamepadBinding

vlib/v/parser/struct.v

@@ -212,6 +212,11 @@ fn (mut p Parser) struct_decl(is_anon bool) ast.StructDecl {
 			mut field_pos := token.Pos{}
 			mut option_pos := token.Pos{}
 
+			if p.tok.kind == .rcbr {
+				ast_fields.last().next_comments << pre_field_comments
+				break
+			}
+
 			if is_embed {
 				// struct embedding
 				type_pos = p.tok.pos()