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vm: add `Unreachable` opcode #34

Merged

saem merged 1 commit into nim-works:main from zerbina:vm-unreachable

Sep 13, 2024

Commits on Sep 12, 2024

vm: add Unreachable opcode

When executing an `Unreachable` instruction, the VM unconditionally
exits with an error of the L0 language.

The opcode is added for the convenience of the code generator / higher-
level passes: a procedure ending in an `Unreachable` statement now no
longer requires an (unnecessary) exit continuation in order to result
in well- formed bytecode.

zerbina committed Sep 12, 2024