From 07e47c058c480914d45ec0b1f9c61b76f59e6299 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Tue, 6 Mar 2018 16:37:03 -0500
Subject: ptrCast builtin now gives an error for removing const qualifier

closes #384
---
 src/ir.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/ir.cpp')

diff --git a/src/ir.cpp b/src/ir.cpp
index 3d1926298d..251c55df4f 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -16816,6 +16816,11 @@ static TypeTableEntry *ir_analyze_instruction_ptr_cast(IrAnalyze *ira, IrInstruc
         return ira->codegen->builtin_types.entry_invalid;
     }
 
+    if (get_ptr_const(src_type) && !get_ptr_const(dest_type)) {
+        ir_add_error(ira, &instruction->base, buf_sprintf("cast discards const qualifier"));
+        return ira->codegen->builtin_types.entry_invalid;
+    }
+
     if (instr_is_comptime(ptr)) {
         ConstExprValue *val = ir_resolve_const(ira, ptr, UndefOk);
         if (!val)
-- 
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