markused: fix for generic ptr receiver on method call (fix #24555) (#24558)

vlib/v/checker/used_features.v

@@ -151,7 +151,11 @@ fn (mut c Checker) markused_method_call(mut node ast.CallExpr, mut left_expr ast
 			c.table.used_features.comptime_calls['${int(left_type)}.${node.name}'] = true
 		}
 	} else if left_type.has_flag(.generic) {
-		c.table.used_features.comptime_calls['${int(c.unwrap_generic(left_type))}.${node.name}'] = true
+		unwrapped_left := c.unwrap_generic(left_type)
+		c.table.used_features.comptime_calls['${int(unwrapped_left)}.${node.name}'] = true
+		if !unwrapped_left.is_ptr() && left_expr is ast.Ident && left_expr.is_mut() {
+			c.table.used_features.comptime_calls['${int(unwrapped_left.ref())}.${node.name}'] = true
+		}
 	}
 }
 

vlib/v/tests/generics/generic_different_type_test.v

@@ -0,0 +1,49 @@
+module main
+
+struct DBFoo {}
+
+struct DBFoo2 {}
+
+struct ConnectionPoolGeneric[T] {
+mut:
+	connections chan T
+}
+
+fn (mut f DBFoo) close() {}
+
+fn (mut f DBFoo2) close() {}
+
+pub fn new_conn_pool[T](size int) !&ConnectionPoolGeneric[T] {
+	$if T is DBFoo2 {
+		mut pool := &ConnectionPoolGeneric[DBFoo2]{
+			connections: chan DBFoo2{cap: size}
+		}
+		return pool
+	} $else {
+		return error('')
+	}
+}
+
+pub fn (mut pool ConnectionPoolGeneric[T]) acquire() !T {
+	conn := <-pool.connections or { return error('Failed mysql') }
+	return conn
+}
+
+pub fn (mut pool ConnectionPoolGeneric[T]) release(conn T) {
+	pool.connections <- conn
+}
+
+pub fn (mut pool ConnectionPoolGeneric[T]) close() {
+	for _ in 0 .. pool.connections.len {
+		mut conn := <-pool.connections or { break }
+		conn.close()
+	}
+}
+
+fn test_main() {
+	mut pool := new_conn_pool[DBFoo](5) or {
+		assert true
+		return
+	}
+	pool.close()
+}