From 7f79a54255ca93c93750e42f6031cc4d1695369c Mon Sep 17 00:00:00 2001
From: pca006132 <john.lck40@gmail.com>
Date: Tue, 6 Oct 2020 14:55:02 +0800
Subject: [PATCH] Fixes none to bool coercion

Fixes #1413 and #1414.
---
 artiq/compiler/transforms/artiq_ir_generator.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/artiq/compiler/transforms/artiq_ir_generator.py b/artiq/compiler/transforms/artiq_ir_generator.py
index a794e9990..a57135ed3 100644
--- a/artiq/compiler/transforms/artiq_ir_generator.py
+++ b/artiq/compiler/transforms/artiq_ir_generator.py
@@ -408,6 +408,8 @@ class ARTIQIRGenerator(algorithm.Visitor):
             length = self.iterable_len(insn)
             return self.append(ir.Compare(ast.NotEq(loc=None), length, ir.Constant(0, length.type)),
                                block=block)
+        elif builtins.is_none(insn.type):
+            return ir.Constant(False, builtins.TBool())
         else:
             note = diagnostic.Diagnostic("note",
                 "this expression has type {type}",