consume_fuel function example does not work as expected

[tessi]

consume_fuel function example does not work as expected

[tessi]

Hey @kimjarvis I believe it's the way you use the Elixir REPL that makes it look like a bug.

You actually execute three different expressions (instead of the two you probably expect):

1. config = %Wasmex.EngineConfig{} create a default EngineConfig and save it in the config variable
2. |> Wasmex.EngineConfig.consume_fuel(true) take the last result and pipe it into consume_fuel/2. The result is printed and then discarded -- the config variable is not updated
3. config.consume_fuel access the consume_fuel field of the config struct created in step 1.

The code (with newline) works in elixir files (.ex/.exs) but not so well in the Elixir REPL because the REPL interprets newlines as a command to execute all things so far. You could work around this by re-assigning config on line two, for example:

iex(1)> config = %Wasmex.EngineConfig{}
iex(2)> config = Wasmex.EngineConfig.consume_fuel(config, true)
iex(3)> config.consume_fuel
true

I'll close this issue, because this is not a bug in Wasmex (and maybe an irritating thing in Elixir core/REPL). Please feel free to re-open the issue if you believe otherwise.