1 files changed, 18 insertions, 0 deletions

diff --git a/src/x86_64/prelude.asm b/src/x86_64/prelude.asm
index abb069b..81a2633 100644
--- a/src/x86_64/prelude.asm
+++ b/src/x86_64/prelude.asm
@@ -82,6 +82,15 @@ printstring:
     syscall
     ret
 
+printlambda:
+    mov     rsi, lambda_str
+    mov     rdx, [rsi]
+    add     rsi, 8
+    mov     rax, 1
+    mov     rdi, 1
+    syscall
+    ret
+
 display:
     ;; is nil?
     mov     rax, rdi
@@ -106,6 +115,15 @@ not_bool:
     ret
 not_string:
 
+    ;; is lambda?
+    mov     rax, rdi
+    and     rax, LAMBDA_MASK
+    cmp     rax, LAMBDA_TAG
+    jne     not_lambda
+    call    printlambda
+    ret
+not_lambda:
+
     ;; is fixnum?
     mov     rax, rdi
     and     rax, FIXNUM_MASK