1 files changed, 1 insertions, 0 deletions
diff --git a/src/c.bqn b/src/c.bqn
index 246634ab..f3c3c9c8 100644
--- a/src/c.bqn
+++ b/src/c.bqn
@@ -170,6 +170,7 @@ Parse ← {r‿vn‿i‿e‿def←𝕨⋄nv←≠vn
   rr←rev⊏r
   hr←rr⊏˜hi←/hf←hh⊏˜⟜IT⌾((⌽g)⊸⊏)¯1=rr
   hl←2=hn←(1⊸»+«)hc←¯1=hr
+  "Only one header per body allowed"_err_(hc/HI) (1+hc/hi)⊏hf
   ho←(»∨·«(hr=3)∧⊢)hl<hd←2≤hr               # Header operands
   "Missing operand in header"_err_(/HF) ho∧hc∨hd
   hm←¬ho∨ha←ho<(0=hr)∧1=hn                  # Mask for main name; header arguments