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  • #948

Closed
Open
Created Nov 27, 2014 by Jochen Burghardt@burghardt

obligation "2+2==5" simplified to "false" by Qed, but then passed to Alt-Ergo nevertheless

ID0001999: This issue was created automatically from Mantis Issue 1999. Further discussion may take place here.


Id Project Category View Due Date Updated
ID0001999 Frama-Clang Plug-in > wp public 2014-11-27 2014-11-27
Reporter Jochen Assigned To correnson Resolution open
Priority normal Severity feature Reproducibility always
Platform frama-c-Neon-20140301+dev-stance OS - OS Version xubuntu-cfe13.10
Product Version - Target Version - Fixed in Version -

Description :

Running "frama-c -wp 167.c" on the attached program yields the output:

... [wp] [Alt-Ergo] Goal typed_foo_assert : Unknown ...

The corresponding file "foo_assert_Alt-Ergo.mlw" contains the goal "goal foo_assert: false", in line 369.

Apparently, Qed succeeds to recognize that the assertion in line 3 of file "167.c" is provably wrong. However, the obligation is passed to the external prover Alt-Ergo nevertheless.

Similar to goals recognized as true by Qed, goals recognized as false needn't be passed to subsequent provers.

Attachments

  • 167.c
  • foo_assert_Alt-Ergo.mlw
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