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HawkForge
a7dbf35f62
When an IF sits in the condition of another IF, BranchPruner only looked at the immediately enclosing IF to decide which branch the condition tokens depend on. If that enclosing IF was itself still in its condition, nothing was recorded, so the link to an outer IF whose branch is being pruned was lost. Those tokens were then evaluated and left on the stack while the rest of the branch was pruned, and the calculation ended with "internal error". Walk up the stack of enclosing IFs to the closest one whose then or else branch contains the nested IF instead. Fixes #3790 Fixes #3755