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Exploring the new Function-keyword based anonymous function-type syntax
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typedef FooOrig<T>(T a); | |
typedef FooNew1 = T Function<T>(T a); | |
typedef FooNew2<T> = T Function(T a); | |
typedef FooNew3<T> = T Function<T>(T a); | |
// DECLARATION // STATIC TYPE | |
FooOrig vf_orig0; // (dynamic) → dynamic | |
FooOrig<int> vf_orig1; // (int) → dynamic | |
T Function<T>(T a) vf_new; // <T>(T) → T | |
FooNew1 vf_new1a; // <T>(T) → T | |
// FooNew1<int> vf_new1b; // error [1] | |
FooNew2 vf_new2a; // (dynamic) → dynamic | |
FooNew2<int> vf_new2b; // (int) → int | |
FooNew3 vf_new3a; // <T>(T) → T | |
FooNew3<int> vf_new3b; // <T>(T) → T | |
T id<T>(T x) => x; | |
int plus1(int i) => i + 1; | |
void main(List<String> arguments) { | |
vf_orig0 = main; | |
vf_orig1 = plus1; | |
// vf_new = main; // error [2] | |
vf_new = id; | |
// vf_new = id<int>; // syntax not supported | |
vf_new2b = plus1; | |
// vf_new3b = main; // error [2] | |
} | |
// [1]: The type 'FooNew1' is declared with 0 type parameters, but 1 type arguments were given. | |
// [2]: error: A value of type '(List<String>) → void' can't be assigned to a variable of type '<T>(T) → T'. |
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