refactor: return a spanned string from typeName

Author: natecraddock

src/tests.zig

@@ -307,16 +307,16 @@ test "typenames" {
     var lua = try Lua.init(testing.allocator);
     defer lua.deinit();
 
-    try expectEqualStringsSentinel("no value", lua.typeName(.none));
-    try expectEqualStringsSentinel("nil", lua.typeName(.nil));
-    try expectEqualStringsSentinel("boolean", lua.typeName(.boolean));
-    try expectEqualStringsSentinel("userdata", lua.typeName(.light_userdata));
-    try expectEqualStringsSentinel("number", lua.typeName(.number));
-    try expectEqualStringsSentinel("string", lua.typeName(.string));
-    try expectEqualStringsSentinel("table", lua.typeName(.table));
-    try expectEqualStringsSentinel("function", lua.typeName(.function));
-    try expectEqualStringsSentinel("userdata", lua.typeName(.userdata));
-    try expectEqualStringsSentinel("thread", lua.typeName(.thread));
+    try expectEqualStrings("no value", lua.typeName(.none));
+    try expectEqualStrings("nil", lua.typeName(.nil));
+    try expectEqualStrings("boolean", lua.typeName(.boolean));
+    try expectEqualStrings("userdata", lua.typeName(.light_userdata));
+    try expectEqualStrings("number", lua.typeName(.number));
+    try expectEqualStrings("string", lua.typeName(.string));
+    try expectEqualStrings("table", lua.typeName(.table));
+    try expectEqualStrings("function", lua.typeName(.function));
+    try expectEqualStrings("userdata", lua.typeName(.userdata));
+    try expectEqualStrings("thread", lua.typeName(.thread));
 }
 
 test "executing string contents" {

src/ziglua.zig

@@ -1095,9 +1095,8 @@ pub const Lua = struct {
     }
 
     /// Returns the name of the given `LuaType` as a null-terminated slice
-    /// TODO: return a spanned string
-    pub fn typeName(lua: *Lua, t: LuaType) [*:0]const u8 {
-        return c.lua_typename(lua.state, @enumToInt(t));
+    pub fn typeName(lua: *Lua, t: LuaType) [:0]const u8 {
+        return std.mem.span(c.lua_typename(lua.state, @enumToInt(t)));
     }
 
     /// Returns the pseudo-index that represents the `i`th upvalue of the running function