[dart-announce] Dart 1.21 is now available

['Michael Thomsen' via Dart Announcements]

Dart SDK version 1.21 has been released.

The release announcement and the changelog have all of the details!

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1.21.0 - 2016-12-07

Language

• Support generic method syntax. Type arguments are not available at runtime. For details, check the informal specification.
• Support access to initializing formals, e.g., the use of x to initialize y in class C { var x, y; C(this.x): y = x; }. Please check the informal specification for details.
• Don't warn about switch case fallthrough if the case ends in a rethrow statement.
• Also don't warn if the entire switch case is wrapped in braces - as long as the block ends with a break, continue, rethrow, return or throw.
• Allow = as well as : as separator for named parameter default values.

Core library changes

• dart:core: Set.difference now takes a Set<Object> as argument.

• dart:developer

  • Added Service class.
    • Allows inspecting and controlling the VM service protocol HTTP server.
    • Provides an API to access the ID of an Isolate.

Tool changes

• Dart Dev Compiler

  • Support calls to loadLibrary() on deferred libraries. Deferred libraries are still loaded eagerly. (#27343)

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