checker: fix calls with result propagation, using other consts, in const declaration expressions (fix #21609) (#25060)

Author: Krchi

vlib/v/checker/checker.v

@@ -4256,9 +4256,10 @@ fn (mut c Checker) ident(mut node ast.Ident) ast.Type {
 					if typ == 0 {
 						old_c_mod := c.mod
 						c.mod = obj.mod
+						inside_const := c.inside_const
 						c.inside_const = true
 						typ = c.expr(mut obj.expr)
-						c.inside_const = false
+						c.inside_const = inside_const
 						c.mod = old_c_mod
 
 						if mut obj.expr is ast.CallExpr {

vlib/v/tests/consts/const_propagate_result_test.v

@@ -0,0 +1,10 @@
+const constant = 5
+const other = init_const(constant)!
+
+fn test_main() {
+	assert other == 5
+}
+
+fn init_const(c int) !int {
+	return c
+}