Tracking issue for constructor tearoffs

[eernstg]

This issue tracks the implementation of the constructor tearoffs feature.

Prerequisite Tasks

• Issue for acceptance of constructor tearoffs feature specification.

Implementation Tasks

• Issue for language tests written.
• Issue for core library updates.
• Issue for implementation in CFE.
• Issue for implementation in DDC.
• Issue for implementation in the VM.
• Issue for implementation in Dartfmt.
• Issue for implementation in build systems and Angular compiler.
• Issue for VM Service support.
• Issue for implementation in Dartdoc.
• Issue for implementation in syntax highlighters
  • Github syntax highlighting.
  • highlight.js support (api.dart.dev, api.pub.dev, Dartdoc):
  • CodeMirror support (DartPad).
• Issue for support in linter.
• Issue for implementation in IntelliJ.
• Issue for implementation in Cider.
• Issue for tests validated as passing (this is managed via the constructor-tearoffs spreadsheet).
• Issue for web debugging support.
• Issue for implementation in dart2js.
• Issue for implementation in Kythe.
• Issue for implementation in Analyzer.
• Issue for documentation.

[jcollins-g]

Added dart-lang/language#1663 and a reference here since many teams/individuals are using these bugs as a signal for when to start implementing as well as tracking issues once implementation begins -- feel free to move that around/correct wording if need be.

[lrhn]

The proposal is accepted and available as a feature specification in the "accepted/" directory.

The experiment flag is called "constructor-tearoffs" even if there are other related features included.

[devoncarew]

Note that the github project we're using to track this work is here: https://github.com/orgs/dart-lang/projects/27.

[eernstg]

@stereotype441, I approved the test failures on language/constructor/explicit_instantiation_syntax_test.dart with a reference to this issue, because the parser is shared between the CFE and the analyzer (so it's a very global thing).

[devoncarew]

An update - all work here (modulo documentation) is complete.