[BUG] Compiler regression on BYOND 516.1675

[master832]

Describe the bug

After updating to BYOND 516.1675, the compiler consistently triggers false-positive errors regarding associative list keys. Specifically, the error "list: numbers are not allowed as associative list keys except in alist()" appears in files that have not been modified and are syntactically correct.

Round ID:

N/A

Steps to Reproduce:

Use BYOND version 516.1675.
Perform a "Clean Compile" of the project.
Observe multiple list: numbers are not allowed as associative list keys errors in unrelated files.

Additional context

This behavior is not present in BYOND 516.1669 or earlier.
While the unterminated text expression error is not explicitly triggered, the cascading nature of the errors suggests a parser scope leakage where the compiler loses track of syntax boundaries from earlier includes.

Compiler output (click to expand)

code\game\mecha\mecha.dm:25:error: list: numbers are not allowed as associative list keys except in alist()
code\controllers\subsystem\skills.dm:12:error: list: numbers are not allowed as associative list keys except in alist()
code\modules\surgery\_surgery_step.dm:60:error: list: numbers are not allowed as associative list keys except in alist()
code\modules\surgery\_surgery_step.dm:69:error: list: numbers are not allowed as associative list keys except in alist()
code\modules\mob\living\carbon\human\human_movement.dm:270:warning (no_parent): ..: ..() has no parent proc to call
code\modules\mob\living\carbon\human\human_movement.dm:273:warning (no_parent): ..: ..() has no parent proc to call
code\datums\hud.dm:64:error: list: numbers are not allowed as associative list keys except in alist()
code\modules\antagonists\devil\devil.dm:143:error: list: numbers are not allowed as associative list keys except in alist()
code\modules\mob\living\simple_animal\hostile\mining_mobs\hivelord.dm:382:error: list: numbers are not allowed as associative list keys except in alist()
roguetown.dmb - 7 errors, 2 warnings