parser: fix duplicated struct attrs on first field (#6859)

vlib/v/fmt/fmt.v

@@ -667,7 +667,7 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
 		}
 		f.write(strings.repeat(` `, max - field.name.len - comments_len))
 		f.write(field_types[i])
-		if field.attrs.len > 0 && field.attrs[0].name != 'ref_only' { // TODO a bug with [ref_only] attr being added to fields, fix it
+		if field.attrs.len > 0 {
 			f.write(strings.repeat(` `, max_type - field_types[i].len))
 			f.inline_attrs(field.attrs)
 		}

vlib/v/fmt/tests/struct_no_extra_attr_keep.vv

@@ -0,0 +1,27 @@
+[typedef]
+struct Foo {
+}
+
+[typedef]
+struct Bar {
+	x string
+	y int
+}
+
+[ref_only]
+struct Baz {
+	x string
+	y int
+}
+
+[inline]
+struct Spam {
+	x string
+	y int
+}
+
+[deprecated]
+struct Eggs {
+	y_y int    [json: yY]
+	x   string [deprecated]
+}

vlib/v/parser/struct.v

@@ -12,6 +12,7 @@ fn (mut p Parser) struct_decl() ast.StructDecl {
 	p.top_level_statement_start()
 	// save attributes, they will be changed later in fields
 	attrs := p.attrs
+	p.attrs = []
 	start_pos := p.tok.position()
 	is_pub := p.tok.kind == .key_pub
 	if is_pub {