From 5b3ef2c02f51919fc76315904a831396c8099304 Mon Sep 17 00:00:00 2001
From: Ayke van Laethem <aykevanlaethem@gmail.com>
Date: Thu, 13 Sep 2018 20:48:23 +0200
Subject: [PATCH] compiler: fix unreachable type assert

The unreachable instruction is actually a block terminator so may only
be inserted at the end of a basic block. This is not always the case for
type asserts, so don't insert this instruction.

LLVM will hopefully optimize it anyway when it realizes anything after
the panic() call is unreachable.
---
 compiler.go | 1 -
 1 file changed, 1 deletion(-)

diff --git a/compiler.go b/compiler.go
index c92f5509..58d2f3d9 100644
--- a/compiler.go
+++ b/compiler.go
@@ -2345,7 +2345,6 @@ func (c *Compiler) parseExpr(frame *Frame, expr ssa.Value) (llvm.Value, error) {
 				} else {
 					fn := c.mod.NamedFunction("runtime.interfaceTypeAssert")
 					c.builder.CreateCall(fn, []llvm.Value{commaOk}, "")
-					c.builder.CreateUnreachable()
 					return undef, nil
 				}
 			}