add C pointer type to @typeInfo

See #1059

std/fmt/index.zig

@@ -236,6 +236,9 @@ pub fn formatType(
                 const casted_value = ([]const u8)(value);
                 return output(context, casted_value);
             },
+            builtin.TypeInfo.Pointer.Size.C => {
+                return format(context, Errors, output, "{}@{x}", @typeName(T.Child), @ptrToInt(value));
+            },
         },
         builtin.TypeId.Array => |info| {
             if (info.child == u8) {

std/meta/index.zig

@@ -463,13 +463,16 @@ pub fn eql(a: var, b: @typeOf(a)) bool {
         builtin.TypeId.Pointer => {
             const info = @typeInfo(T).Pointer;
             switch (info.size) {
-                builtin.TypeInfo.Pointer.Size.One, builtin.TypeInfo.Pointer.Size.Many => return a == b,
+                builtin.TypeInfo.Pointer.Size.One,
+                builtin.TypeInfo.Pointer.Size.Many,
+                builtin.TypeInfo.Pointer.Size.C,
+                => return a == b,
                 builtin.TypeInfo.Pointer.Size.Slice => return a.ptr == b.ptr and a.len == b.len,
             }
         },
         builtin.TypeId.Optional => {
-            if(a == null and b == null) return true;
-            if(a == null or b == null) return false;
+            if (a == null and b == null) return true;
+            if (a == null or b == null) return false;
             return eql(a.?, b.?);
         },
         else => return a == b,

std/testing.zig

@@ -69,7 +69,7 @@ pub fn expectEqual(expected: var, actual: var) void {
                     }
                 },
 
-                builtin.TypeInfo.Pointer.Size.Slice => { 
+                builtin.TypeInfo.Pointer.Size.Slice => {
                     if (actual.ptr != expected.ptr) {
                         std.debug.panic("expected slice ptr {}, found {}", expected.ptr, actual.ptr);
                     }
@@ -122,7 +122,6 @@ pub fn expectEqual(expected: var, actual: var) void {
                 }
             }
         },
-
     }
 }