Unexpected end of script when nesting if inside match

Created by: PigeonF

Reproduction: Run the following piece of code

match "foo"
    case "foo"
        if true
            echo "This is executed"
        end
end

Expected behavior: "This is executed" gets printed (it does) and ion exits successfully.

Actual behavior: "This is executed" gets printed and ion exits with "ion: unexpected end of script: expected end block for Default" and 1 as an exit code

Build information: Ion built with rustc 1.25.0-nightly (3ec5a99aa 2018-02-14),

ion 1.0.0-alpha (x86_64-apple-darwin) rev 22b3efc6eb29020b452c44ad057c394951f6b982

Misc: This issue also occurs when trying to run ion setup.ion build docs.

Note: I just started looking into ion, so this might just be me being unable to grasp the syntax