fix: PANIC at Lean.MVarId.falseOrByContra
#5157
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eric-wieser
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| match gs with | ||
| | some [] => return none | ||
| | some [g] => return some (← g.intro1).2 | ||
| | some _ => panic! "expected at most one sugoal" |
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| | some _ => panic! "expected at most one sugoal" | |
| | some _ => panic! "expected at most one subgoal" |
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closes #4985
closes #4984