definition of virtual function in subclass causes crash
ID0001973:
**This issue was created automatically from Mantis Issue 1973. Further discussion may take place here.**
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| **Id** | **Project** | **Category** | **View** | **Due Date** | **Updated** |
| --- | --- | --- | --- | --- | --- |
| ID0001973 | Frama-Clang | Plug-in > clang | public | 2014-11-17 | 2015-02-15 |
| | | | | | |
| --- | --- | --- | --- | --- | --- |
| **Reporter** | Jochen | **Assigned To** | virgile | **Resolution** | fixed |
| **Priority** | normal | **Severity** | crash | **Reproducibility** | always |
| **Platform** | frama-c-Neon-20140301+dev-stance | **OS** | - | **OS Version** | xubuntu-cfe13.10 |
| **Product Version** | - | **Target Version** | - | **Fixed in Version** | - |
### Description :
output:
Now output intermediate result
137.cpp:5:[fclang] failure: No usable assign operator for ::Rectangle
[kernel] Current source was: 137.cpp:5
The full backtrace is:
Raised at file "src/kernel/log.ml", line 524, characters 30-31
Called from file "src/kernel/log.ml", line 518, characters 9-16
Re-raised at file "src/kernel/log.ml", line 521, characters 15-16
Called from file "src/frama-clang/convert.ml", line 1660, characters 30-71
Called from file "src/frama-clang/convert.ml", line 1683, characters 15-39
Called from file "list.ml", line 74, characters 24-34
Called from file "src/frama-clang/convert.ml", line 1686, characters 14-50
Called from file "src/frama-clang/convert.ml", line 1921, characters 21-142
Called from file "list.ml", line 74, characters 24-34
Called from file "src/frama-clang/convert.ml", line 1998, characters 19-78
Called from file "src/frama-clang/convert.ml", line 2262, characters 21-48
Called from file "list.ml", line 74, characters 24-34
Called from file "src/frama-clang/convert.ml", line 2266, characters 4-79
Called from file "src/frama-clang/frama_Clang_register.ml", line 86, characters 13-36
Called from file "src/kernel/file.ml", line 1073, characters 10-43
Called from file "src/kernel/file.ml", line 1117, characters 23-30
Called from file "list.ml", line 74, characters 24-34
Called from file "src/kernel/file.ml", line 1114, characters 6-520
Called from file "src/kernel/file.ml", line 2179, characters 12-30
Called from file "src/kernel/file.ml", line 2264, characters 4-27
Called from file "src/kernel/ast.ml", line 111, characters 2-28
Called from file "src/kernel/ast.ml", line 123, characters 53-71
Called from file "src/kernel/boot.ml", line 29, characters 6-20
Called from file "src/kernel/cmdline.ml", line 761, characters 2-9
Called from file "src/kernel/cmdline.ml", line 216, characters 4-8
Plug-in fclang aborted: internal error.
Please report as 'crash' at http://bts.frama-c.com/.
Your Frama-C version is Neon-20140301+dev-stance.
The problem disappears if
(1) the "virtual" is removed in line 6, or
(2) a copy of line 6 is inserted after line 2;
the problem remains if
(3) "area" is declared in class "Rectangle", too, but not as "virtual".
## Attachments
- [137.cpp](/uploads/b9c024091e5c2197c3677797a25f89a0/137.cpp)
issue