Or, maybe not:

~/tmp $ dartfmt const_asserts.dart 
Could not format because the source could not be parsed:

line 6, column 7 of const_asserts.dart: Expected an identifier.
    : assert(children != null), assert(!children.any((child) => child == null));
      ^^^^^^
line 6, column 7 of const_asserts.dart: Expected an assignment after the field name.
    : assert(children != null), assert(!children.any((child) => child == null));
      ^^^^^^
line 6, column 7 of const_asserts.dart: Expected an identifier.
    : assert(children != null), assert(!children.any((child) => child == null));
      ^^^^^^
line 6, column 7 of const_asserts.dart: A function body must be provided.
    : assert(children != null), assert(!children.any((child) => child == null));
      ^^^^^^
line 6, column 7 of const_asserts.dart: Expected a class member.
    : assert(children != null), assert(!children.any((child) => child == null));
      ^^^^^^
line 6, column 7 of const_asserts.dart: Unexpected text 'assert'.
    : assert(children != null), assert(!children.any((child) => child == null));
      ^^^^^^
line 6, column 13 of const_asserts.dart: Expected a class member.
    : assert(children != null), assert(!children.any((child) => child == null));
            ^
line 6, column 13 of const_asserts.dart: Unexpected text '('.
    : assert(children != null), assert(!children.any((child) => child == null));
            ^
line 6, column 23 of const_asserts.dart: Expected a class member.
    : assert(children != null), assert(!children.any((child) => child == null));
                      ^^
line 6, column 23 of const_asserts.dart: Expected a class member.
    : assert(children != null), assert(!children.any((child) => child == null));
                      ^^
(23 more errors...)
~/tmp $ dartfmt --assert-initializer const_asserts.dart 
Could not find an option named "assert-initializers".

Usage: dartfmt [-n|-w] [files or directories...]

-h, --help                   Shows usage information.
    --version                Shows version information.
-l, --line-length            Wrap lines longer than this.
                             (defaults to "80")

-i, --indent                 Spaces of leading indentation.
                             (defaults to "0")

    --preserve               Selection to preserve, formatted as "start:length".
-n, --dry-run                Show which files would be modified but make no changes.
    --set-exit-if-changed    Return exit code 1 if there are any formatting changes.
-w, --overwrite              Overwrite input files with formatted output.
-m, --machine                Produce machine-readable JSON output.
    --profile                Display profile times after running.
    --follow-links           Follow links to files and directories.
                             If unset, links will be ignored.

-t, --transform              Unused flag for compability with the old formatter.

I'm using dartfmt 0.2.13, not sure if that's the latest?

Formatter should handle asserts in initializer list. #522

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