Rust Result Expected 2 Type Arguments. The Result type is a way of representing one of two possible outcomes in a computation. I recently encountered an issue where I couldnt compile because the build method tries to return a Result and because Ive created my own Result type its signature is just Result.
The Type System further allows for richer code hinting and automated documentation too. This function can be used to compose the results of two functions. Single-character options are expected to appear on the command line with a single preceding dash.
Functions return Result whenever errors are expected and recoverable.
Let us look at an example where the OkT variant of the Result enum is of the wrong type. Wrong number of type arguments. This ensures that the code behaves as expected. We can omit these and just write _ since Rust can infer them from the contents of the Iterator but if youre curious the specific type is HashMap.