[−][src]Macro core::todo
Indicates unfinished code.
This can be useful if you are prototyping and are just looking to have your
code typecheck. todo!
works exactly like unimplemented!
. The only
difference between the two macros is the name.
Panics
This will always panic!
Examples
Here's an example of some in-progress code. We have a trait Foo
:
trait Foo { fn bar(&self); fn baz(&self); }Run
We want to implement Foo
on one of our types, but we also want to work on
just bar()
first. In order for our code to compile, we need to implement
baz()
, so we can use todo!
:
#![feature(todo_macro)] struct MyStruct; impl Foo for MyStruct { fn bar(&self) { // implementation goes here } fn baz(&self) { // let's not worry about implementing baz() for now todo!(); } } fn main() { let s = MyStruct; s.bar(); // we aren't even using baz() yet, so this is fine. }Run