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Updates to void. #28943

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floitschG opened this issue Mar 1, 2017 · 3 comments
Closed
3 tasks done

Updates to void. #28943

floitschG opened this issue Mar 1, 2017 · 3 comments
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area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). area-meta Cross-cutting, high-level issues (for tracking many other implementation issues, ...). closed-obsolete Closed as the reported issue is no longer relevant language-strong-mode-polish

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@floitschG
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floitschG commented Mar 1, 2017 •
edited by eernstg
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void will be updated in the following way:

  • in checked mode, void accepts any value. The old behavior only allowed null. In checked mode, void should allow any value. #28935
  • an arrow function (declared with =>) is allowed to have expressions of any type if the return type is void. For example void foo() => x++;. void arrow functions should allow any rhs type #28939
  • void is allowed as a type argument to generics. The most common use cases are things like Future<void> or Visitor<void>. Statically and dynamically, in Dart 1, a generic void is treated similar to Object, except for functions, where the old behavior is maintained. In particular, a void-function is not assignable to an int-function (or any other non-void function). Allow "void" as a type argument #27504
@floitschG floitschG added the area-meta Cross-cutting, high-level issues (for tracking many other implementation issues, ...). label Mar 1, 2017
@floitschG floitschG added this to the 1.23 milestone Mar 1, 2017
@floitschG floitschG self-assigned this Mar 1, 2017
@mit-mit mit-mit added the area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). label Mar 2, 2017
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mit-mit commented Mar 15, 2017

Punting to 1.24 per dart-leads discussion.

@mit-mit mit-mit modified the milestones: 1.24, 1.23 Mar 15, 2017
@dgrove
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dgrove commented May 5, 2017

@floitschG - all of the void changes look unlikely to land for 1.24, from what I see. Can these move to 1.25?

@floitschG floitschG modified the milestones: 1.25, 1.24 May 9, 2017
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@dgrove
Dan is this a feature we want post 1.24 Dartium?

@matanlurey matanlurey added the closed-obsolete Closed as the reported issue is no longer relevant label Feb 9, 2018
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area-language Dart language related items (some items might be better tracked at github.com/dart-lang/language). area-meta Cross-cutting, high-level issues (for tracking many other implementation issues, ...). closed-obsolete Closed as the reported issue is no longer relevant language-strong-mode-polish
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@matanlurey @terrylucas @dgrove @leafpetersen @floitschG @mit-mit