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import org.checkerframework.checker.nullness.qual.EnsuresNonNullIf;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.Pure;
class ReadyReadLine {
void m(MyBufferedReader buf) throws Exception {
if (buf.ready()) {
String line = buf.readLine();
line.toString();
}
if (buf.readLine() != null) {
// :: error: (dereference.of.nullable)
buf.readLine().toString();
}
}
}
// this is a replication of the JDK BufferedReader (with only the relevant methods)
class MyBufferedReader {
public @Nullable String readLine() throws Exception {
return null;
}
@EnsuresNonNullIf(expression = "readLine()", result = true)
@Pure
public boolean ready() throws Exception {
// don't bother with implementation.
// :: error: (contracts.conditional.postcondition.not.satisfied)
return true;
}
}
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