Weirdly-valid indented code causes a compile error

[ike709]

This code is in Eternia:

// snip
    if(target)
        SpawnSmite(caster, target.loc,spell_dmg)
        projectilesleft--
    var/list/turfs = new/list()
        for(var/turf/T in oview(7,target.loc))
            turfs += T
    while(projectilesleft && turfs.len > 0)
// snip

Note the for loop that has extra indentation.

It (surprisingly) compiles in BYOND but doesn't in OpenDream with an Expected end of proc statement error

[ZeWaka]

Why does this compile in byond