From 270933b1e997c91a9c2d28b6896d625c0ae1b163 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Tue, 12 Feb 2019 10:25:21 -0500
Subject: [PATCH] compile error test for casting integer to c pointer

when the int has more bits than pointers

See #1059
---
 src/ir.cpp              |  4 +++-
 test/compile_errors.zig | 14 ++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/ir.cpp b/src/ir.cpp
index 00d82c922..50b5661e1 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -10882,7 +10882,9 @@ static IrInstruction *ir_analyze_int_to_c_ptr(IrAnalyze *ira, IrInstruction *sou
             ira->codegen->builtin_types.entry_usize->data.integral.bit_count)
         {
             ir_add_error(ira, source_instr,
-                buf_sprintf("integer type too big for implicit @intToPtr to type '%s'", buf_ptr(&dest_type->name)));
+                buf_sprintf("integer type '%s' too big for implicit @intToPtr to type '%s'",
+                    buf_ptr(&integer->value.type->name),
+                    buf_ptr(&dest_type->name)));
             return ira->codegen->invalid_instruction;
         }
 
diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index 63850bb88..8f8e2a0bd 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -1,6 +1,20 @@
 const tests = @import("tests.zig");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
+    cases.addTest(
+        "implicit casting too big integers to C pointers",
+        \\export fn a() void {
+        \\    var ptr: [*c]u8 = (1 << 64) + 1;
+        \\}
+        \\export fn b() void {
+        \\    var x: @IntType(false, 65) = 0x1234;
+        \\    var ptr: [*c]u8 = x;
+        \\}
+    ,
+        ".tmp_source.zig:2:33: error: integer value 71615590737044764481 cannot be implicitly casted to type 'usize'",
+        ".tmp_source.zig:6:23: error: integer type 'u65' too big for implicit @intToPtr to type '[*c]u8'",
+    );
+
     cases.addTest(
         "C pointer pointing to non C ABI compatible type",
         \\const Foo = struct {};