From 57edd4dcb31eeaca69b93d2caf0e1f4eb3772e3e Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Thu, 8 Feb 2018 18:13:07 -0500
Subject: [PATCH] error sets - fix bad value for constant error literal

---
 src/ir.cpp           |  2 +-
 test/cases/error.zig | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/ir.cpp b/src/ir.cpp
index 25723535dd..728a3e815c 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -12308,7 +12308,7 @@ static TypeTableEntry *ir_analyze_instruction_field_ptr(IrAnalyze *ira, IrInstru
                 if (!resolve_inferred_error_set(ira, child_type, field_ptr_instruction->base.source_node)) {
                     return ira->codegen->builtin_types.entry_invalid;
                 }
-                ErrorTableEntry *err_entry = find_err_table_entry(child_type, field_name);
+                err_entry = find_err_table_entry(child_type, field_name);
                 if (err_entry == nullptr) {
                     ir_add_error(ira, &field_ptr_instruction->base,
                         buf_sprintf("no error named '%s' in '%s'", buf_ptr(field_name), buf_ptr(&child_type->name)));
diff --git a/test/cases/error.zig b/test/cases/error.zig
index 0322cb9246..3d2835e723 100644
--- a/test/cases/error.zig
+++ b/test/cases/error.zig
@@ -108,3 +108,18 @@ fn testErrorSetType() void {
         error.FileNotFound => unreachable,
     }
 }
+
+
+test "explicit error set cast" {
+    testExplicitErrorSetCast(Set1.A);
+    comptime testExplicitErrorSetCast(Set1.A);
+}
+
+const Set1 = error{A, B};
+const Set2 = error{A, C};
+
+fn testExplicitErrorSetCast(set1: Set1) void {
+    var x = Set2(set1);
+    var y = Set1(x);
+    assert(y == error.A);
+}