From 3cb1bb7c36be14e33f8af419591201be8e5a4952 Mon Sep 17 00:00:00 2001
From: StunxFS <56417208+StunxFS@users.noreply.github.com>
Date: Fri, 12 Mar 2021 13:02:09 -0400
Subject: [PATCH] checker: check the amount of parameters passed to
 `json.decode()` (#9267)

---
 vlib/v/checker/checker.v | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index af472ebf25..840ee489f2 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -1728,6 +1728,11 @@ pub fn (mut c Checker) call_fn(mut call_expr ast.CallExpr) table.Type {
 	}
 	if fn_name == 'json.encode' {
 	} else if fn_name == 'json.decode' && call_expr.args.len > 0 {
+		if call_expr.args.len != 2 {
+			c.error("json.decode expects 2 arguments, a type and a string (e.g `json.decode(T, '')`)",
+				call_expr.pos)
+			return table.void_type
+		}
 		expr := call_expr.args[0].expr
 		if expr !is ast.Type {
 			typ := expr.type_name()