Ad debugger safepoint before returning from a function/method that shows the return value

[DartBot]

Originally opened as dart-lang/sdk#22232

This issue was originally filed by @zoechi

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What steps will clearly show the issue / need for enhancement?
1.

Try to debug code like
return f1(a).f2(b).f3(c).f4(d);

especially when fx() are similar one-line expression.

2.
3.

What is the current output?
Only the result of the entire expression can be examined but no way to see intermediate values.

What would you like to see instead?
A debugger safepoint just before the function/methods returns but where the return value is already available.
The return value should be show in the variables view.

What version of the product are you using? On what operating system?
Dart VM version: 1.9.0-edge.43350 (Sun Feb 1 23:45:32 2015) on "linux_x64"

Please provide any additional information below.

[DartBot]

This comment was originally written by @zoechi

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It should be possible to explicitly set a breakpoint for this, for example on the closing curly bracket of a function block.

[DartBot]

This comment was originally written by @zoechi

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Even harder when the function returns a future

Future<Foo> f() {
  return f1(a).f2(b).f3(c).f4(d);
}

where the debugger doesn't step to the .then() part of the calling code but to some code in zone.dart.

[DartBot]

Comment by clayberg

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Set owner to @devoncarew.
Removed Priority-Unassigned label.
Added Priority-Medium label.