bug25926.js(4,18): error TS7006: Parameter 'n' implicitly has an 'any' type.
bug25926.js(11,27): error TS7006: Parameter 'm' implicitly has an 'any' type.


==== bug25926.js (2 errors) ====
    /** @type {{ a(): void; b?(n: number): number; }} */
    const o1 = {
        a() {
            this.b = n => n;
                     ~
!!! error TS7006: Parameter 'n' implicitly has an 'any' type.
        }
    };
    
    /** @type {{ d(): void; e?(n: number): number; f?(n: number): number; g?: number }} */
    const o2 = {
        d() {
            this.e = this.f = m => this.g || m;
                              ~
!!! error TS7006: Parameter 'm' implicitly has an 'any' type.
        }
    };
    
    