[tlaplus] Question about the order of evaluation.

[HP <huapengyuan@xxxxxxxxx>]

VARIABLES x

Init == /\ x = 1

Next == /\ PrintT("{") /\ PrintT(x) /\ x' = 2 /\ PrintT(x') /\ PrintT("}")

Below is the output for BFS. It makes sense to me. 

"{"

1

2

"}"

"{"

2

2

"}"

But why the output is different with DFS? Why have "{12}" is printed twice? Anyone can explain to me? Thanks.

"{"

1

2

"}"

"{"

1

2

"}"

"{"

2

2

"}"

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