The decoder already reports "Instruction X at IL offset N leaves method
body" when an operand's computed end passes the IL body, but only after
the operand was read. Operand readers use Buffer reads, so an operand
cut off by the body end threw a RangeError first. The catch-all stored
Node's message ("Attempt to access memory outside buffer bounds" or an
offset RangeError) as body.issue, dropping the instruction and offset.
A body ending in a lone 0xFE two-byte opcode prefix failed the same way.
Treat a RangeError from the operand read as the operand leaving the body
so the existing diagnostic applies, and check the second opcode byte
before reading it. Malformed status, partial coverage and earlier
decoded instructions are unchanged.
Fixes#2677
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Kaoru0822
morluto