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C1.java:1: error: [initialization.fields.uninitialized] the constructor does not initialize fields: o
public class C1 {
^
C2.java:2: error: [assignment.type.incompatible] incompatible types in assignment.
Object o = null;
^
found : null
required: @Initialized @NonNull Object
C3.java:4: error: cannot find symbol
void bad(XXX p) {
^
symbol: class XXX
location: class C3b
C4.java:3: error: [dereference.of.nullable] dereference of possibly-null reference p
p.toString();
^
4 errors
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