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var H: [ref,name]int;
var that: ref;
const X: name;
const Y: name;
procedure P(this: ref);
modifies H;
ensures H[this,X] == 5;
implementation P(this: ref) {
start:
H[this,X] := 5;
return;
}
procedure Q(this: ref);
modifies H;
ensures (forall o: ref, F: name :: o == this && F == X ==> H[o,F] == 5);
implementation Q(this: ref) {
start:
H[this,X] := 5;
return;
}
implementation Q(this: ref) {
start:
H[this,X] := 7;
return; // error
}
implementation Q(this: ref) {
start:
return; // error
}
implementation Q(this: ref) {
start:
H[that,X] := 5;
return; // error
}
implementation Q(this: ref) {
start:
H[this,Y] := 5;
return; // error
}
implementation Q(this: ref) {
start:
call P(this);
return;
}
implementation Q(this: ref) {
start:
call Q(this);
return;
}
implementation Q(this: ref) {
start:
call P(this);
call Q(this);
return;
}
implementation Q(this: ref) {
start:
call P(that);
return; // error
}
type name, ref;
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