Lexical names get translated into indexed accesses into lexical pads at compile time. For a metaphor, imagine that the compiler keeps a hash translating $lexname to $lex_id. When a doubly-nested eval runs at runtime, the name doesn't really exist anymore.

In reply to Re^3: Non-definition of lexical referenced in string eval by chromatic
in thread Non-definition of lexical referenced in string eval by AnomalousMonk

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