// @target: esnext

type K = number | string;
type T = {
    [K]: number;  // Did you mean to use 'P in K'?
}

const K1 = Symbol();
type T1 = {
    [K1]: number;
}

type K2 = "x" | "y";
type T2 = {
    [K2]: number;  // Did you mean to use 'K in K2'?
}

type K3 = number | string;
type T3 = {
    [K3]: number; // Did you mean to use 'K in K3'?
}

type K4 = number | string;
type T4 = {
    [K4]: number;
    k4: string;
}