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-rw-r--r--module/system/vm/assembler.scm2
1 files changed, 2 insertions, 0 deletions
diff --git a/module/system/vm/assembler.scm b/module/system/vm/assembler.scm
index bed2bf77a..8bbe1d90e 100644
--- a/module/system/vm/assembler.scm
+++ b/module/system/vm/assembler.scm
@@ -1481,6 +1481,8 @@ procedure with label @var{rw-init}. @var{rw-init} may be false. If
(define (write-arities asm metas headers names-port strtab)
(define (write-header pos low-pc high-pc offset flags nreq nopt nlocals)
+ (unless (<= (+ nreq nopt) nlocals)
+ (error "forgot to emit definition instructions?"))
(bytevector-u32-set! headers pos (* low-pc 4) (asm-endianness asm))
(bytevector-u32-set! headers (+ pos 4) (* high-pc 4) (asm-endianness asm))
(bytevector-u32-set! headers (+ pos 8) offset (asm-endianness asm))