================
@@ -778,42 +781,61 @@ void StreamChecker::evalFgetc(const FnDescription *Desc,
const CallEvent &Call,
assertStreamStateOpened(OldSS);
----------------
steakhal wrote:
This patch caused a downstream test failure.
Here is the fix:
```suggestion
// We don't model the buffer, thus they should escape.
State = Call.invalidateRegions(C.blockCount(), State);
```
Test where it currently breaks:
```c++
void test_double_switch_ok() {
char buffer[10] = {10};
FILE *F1 = tmpfile();
if (!F1)
return;
char* s = fgets(buffer, sizeof(buffer), F1); // ok
if (s) {
clang_analyzer_dump_char(buffer[0]); // expected-warning {{conj_$}} Should
not preserve the previous value, thus should not be 10.
}
// Hmm, what do we know of the buffer on failure? IDK.
fclose(F1);
}
```
https://github.com/llvm/llvm-project/pull/73638
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