unary prefix operator (logical compliment) gives strange compiler warning

[DartBot]

This issue was originally filed by @bp74

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What steps will reproduce the problem?

class foo {
  num a, b;
  foo(this.a, this.b);
  
  num get a2() => this.a;
  num get b2() => this.b;
 
  check()
  {
    if (!(this.a2 >= this.b2)) { /* compiler warning / }
    if (this.a2 >= this.b2) { / okay / }
    if (!(a2 >= b2)) { / okay */ }
  }
}

What is the expected output? What do you see instead?

For the code shown above, you get this compiler warning:
() -> num has no method named "operator >="

The 2nd and 3rd "if" statement gives no warning!

What version of the product are you using? On what operating system?
Dart Editor 7916 32 bit, Windows 7 64 bit

[DartBot]

This comment was originally written by @bp74

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hhmmm ... sorry about the "dart2js" in the subject, is this the compiler or just a source analyzer? Anyway you get the idea :)

[kasperl]

Added Area-Analyzer, Triaged labels.
Changed the title to: "unary prefix operator (logical compliment) gives strange compiler warning".

[DartBot]

This comment was originally written by @bp74

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Tested with Dart Editor Build 7992: the issue is solved.

[danrubel]

Added this to the M1 milestone.

[scheglov]

Set owner to @scheglov.
Added AssumedStale label.