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=== tests/cases/compiler/typeInferenceTypePredicate2.ts ===
[true, true, false, null]
>[true, true, false, null] .filter((thing): thing is boolean => thing !== null) .map(thing => thing.toString()) : string[]
>[true, true, false, null] .filter((thing): thing is boolean => thing !== null) .map : <U>(callbackfn: (value: boolean, index: number, array: boolean[]) => U, thisArg?: any) => U[]
>[true, true, false, null] .filter((thing): thing is boolean => thing !== null) : boolean[]
>[true, true, false, null] .filter : { <S extends boolean>(callbackfn: (value: boolean, index: number, array: boolean[]) => value is S, thisArg?: any): S[]; (callbackfn: (value: boolean, index: number, array: boolean[]) => any, thisArg?: any): boolean[]; }
>[true, true, false, null] : boolean[]
>true : true
>true : true
>false : false
>null : null
.filter((thing): thing is boolean => thing !== null)
>filter : { <S extends boolean>(callbackfn: (value: boolean, index: number, array: boolean[]) => value is S, thisArg?: any): S[]; (callbackfn: (value: boolean, index: number, array: boolean[]) => any, thisArg?: any): boolean[]; }
>(thing): thing is boolean => thing !== null : (thing: boolean) => thing is boolean
>thing : boolean
>thing !== null : boolean
>thing : boolean
>null : null
.map(thing => thing.toString());
>map : <U>(callbackfn: (value: boolean, index: number, array: boolean[]) => U, thisArg?: any) => U[]
>thing => thing.toString() : (thing: boolean) => string
>thing : boolean
>thing.toString() : string
>thing.toString : () => string
>thing : boolean
>toString : () => string
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