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Thanks for the report. I just landed a related fix that might address this (https://codereview.chromium.org/231743002/). The current behavior formats this:

class Vector3 {
  var storage;
  Vector3(double x_, double y_, double z_): storage = new Float32List(3) {
    setValues(x_, y_, z_);
  }
}

to:

class Vector3 {
  var storage;
  Vector3(double x_, double y_, double z_) : storage = new Float32List(3) {
    setValues(x_, y_, z_);
  }
}

If you're still seeing surprising results after r34893, please re-open this bug and include the expected output.

Again thanks for the feedback!

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This comment was originally written by @Fox32

Maybe the formatting rule should be more specific in the Dart Style Guide as I assumed that it is required to always do a new line before the ':'.

https://www.dartlang.org/articles/style-guide/#do-format-constructor-initialization-lists-with-each-field-on-its-own-line

Ah, wait. Good catch. I think we agreed that a single initializer could live on a single line but now I'm not sure. Anyway, either this or the style guide need updating. :)

Bob, Siggi: thoughts?

cc @sigmundch.
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Yes - inline initializers are allowed, and are not necessarily limited to just one. Only when you exceed the 80 column limit we need to break on the ":".

I believe all of these are valid (correctly formatted) as is:

class Classname {
  int a;
  int b;
  int c;

  Classname.one() : a = 1, b = 2, c = 3;

  Classname.two() : a = 1, b = 2, c = 3 {
    ...
  }

  Classname.three()
    : a = 1, b = 2, c = 3 {
    ...
  }

  Classname.three()
    : a = 1,
      b = 2,
      c = 3 {
    ...
  }

+1 what Siggy said (though personally I always wrap them). One nit: the ":" should be indented +4, like:

  Classname.three()
      : a = 1, b = 2, c = 3 {
    ...
  }

This comment was originally written by @Fox32

Then the guide should be updated, as it states: "DO format constructor initialization lists with each field on its own line."

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This issue has been moved to dart-lang/dart_style#335.