File: FlowInitialization.java

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import org.checkerframework.checker.initialization.qual.*;
import org.checkerframework.checker.nullness.qual.*;
import org.checkerframework.framework.qual.EnsuresQualifier;

public class FlowInitialization {

    @NonNull String f;
    @Nullable String g;

    // :: error: (initialization.fields.uninitialized)
    public FlowInitialization() {}

    public FlowInitialization(long l) {
        g = "";
        f = g;
    }

    // :: error: (initialization.fields.uninitialized)
    public FlowInitialization(boolean b) {
        if (b) {
            f = "";
        }
    }

    // :: error: (initialization.fields.uninitialized)
    public FlowInitialization(int i) {
        if (i == 0) {
            throw new RuntimeException();
        }
    }

    // :: error: (initialization.fields.uninitialized)
    public FlowInitialization(char c) {
        if (c == 'c') {
            return;
        }
        f = "";
    }

    public FlowInitialization(double d) {
        setField();
    }

    @EnsuresQualifier(expression = "f", qualifier = NonNull.class)
    public void setField(@UnknownInitialization FlowInitialization this) {
        f = "";
    }
}

class FlowPrimitives {
    boolean b;
    int t;
    char c;
}