[WIP] EXP_CANT_INTERPRET => TOKcantexp
Merge pull request #4141 from WalterBright/cantinterpret2

EXP_CANT_INTERPRET => TOKcantexp
Issue 8246: tuple fields should use reserved identifiers
Merge pull request #4150 from quickfur/issue8246

Issue 8246: tuple fields should use reserved identifiers
[CTFE] questions in interpreter code
Reduce complexity
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+comment