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tests/cases/compiler/genericArgumentCallSigAssignmentCompat.ts(16,31): error TS2345: Argument of type '<T>(value: T) => T' is not assignable to parameter of type 'Iterator<string | number | boolean, boolean>'.
Type 'string | number | boolean' is not assignable to type 'boolean'.
Type 'string' is not assignable to type 'boolean'.
==== tests/cases/compiler/genericArgumentCallSigAssignmentCompat.ts (1 errors) ====
module Underscore {
export interface Iterator<T, U> {
(value: T, index: any, list: any): U;
}
export interface Static {
all<T>(list: T[], iterator?: Iterator<T, boolean>, context?: any): boolean;
identity<T>(value: T): T;
}
}
declare var _: Underscore.Static;
// No error, Call signatures of types '<T>(value: T) => T' and 'Underscore.Iterator<{}, boolean>' are compatible when instantiated with any.
// Ideally, we would not have a generic signature here, because it should be instantiated with {} during inferential typing
_.all([true, 1, null, 'yes'], _.identity);
~~~~~~~~~~
!!! error TS2345: Argument of type '<T>(value: T) => T' is not assignable to parameter of type 'Iterator<string | number | boolean, boolean>'.
!!! error TS2345: Type 'string | number | boolean' is not assignable to type 'boolean'.
!!! error TS2345: Type 'string' is not assignable to type 'boolean'.
// Ok, because fixing makes us infer boolean for T
_.all([true], _.identity);
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