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$\begingroup$ You could use $ConditionHold here: Hold[ b, a + b ] /. key_ :> RuleCondition[ Lookup[ code, key, None, $ConditionHold ], KeyExistsQ[ code, key ] ] $\endgroup$

rhennigan
– rhennigan

2024-09-03 13:55:52 +00:00
Commented Sep 3, 2024 at 13:55
1

$\begingroup$ Note that you'll probably want Unevaluated[key] instead of key on the rhs to avoid evaluation leaks. $\endgroup$

rhennigan
– rhennigan

2024-09-03 13:58:40 +00:00
Commented Sep 3, 2024 at 13:58

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