Ticket #4 (closed defect: fixed)

Opened 10 years ago

Last modified 9 years ago

Don't allow assignment in an assert

Reported by: Chuck.Esterbrook Owned by: Chuck
Priority: major Milestone:
Component: Cobra Workspace Version: 0.7.4
Keywords: Cc:


Asserts should have no side effects as they may be excluded (-include-asserts:no or -turbo). Particularly, the top level expression should not be an assignment as this is usually just a typo where the programmer meant to say "x == y", not "x = y". This often gives a warning:

warning: The expression "..." (of type "...") will always evaluate to true because it is not nilable. You can remove the expression.

It should always give an error with a more appropriate message.


assert-assign.patch Download (4.5 KB) - added by hopscc 9 years ago.

Change History

Changed 9 years ago by hopscc

  • owner set to hopscc
  • status changed from new to assigned

Changed 9 years ago by hopscc

Changed 9 years ago by hopscc

I'm providing patch to fix this.

Assignments as an assert condition generate an error
Conditions that generate a 'always true cos not nilable' warning have
the warning message augmented with corrections specific to an assert ( the actual wording of this could probably be improved)

Changed 9 years ago by hopscc

  • owner changed from hopscc to Chuck

Changed 9 years ago by Chuck

  • status changed from assigned to closed
  • resolution set to fixed

I've made a further enhancement to this that if the condition .willChangeVar then an error will be generated. In addition to a top-level assignment expression, this also covers nested expressions, 'out' parameters and all forms of augmented assignment. See changeset:1545

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