__bd = W_[mut_list]; \
if (bdescr_free(__bd) >= bdescr_start(__bd) + BLOCK_SIZE) { \
W_ __new_bd; \
- "ptr" __new_bd = foreign "C" allocBlock_lock() [regs]; \
+ ("ptr" __new_bd) = foreign "C" allocBlock_lock() [regs]; \
bdescr_link(__new_bd) = __bd; \
__bd = __new_bd; \
W_[mut_list] = __bd; \