`Dict`s evaluated at comptime miss their lookups at runtime

[niclas-ahden]

app [main!] { pf: platform "test/fx/platform/main.roc" }

import pf.Stdout
import pf.Stdin

top_dict = Dict.single("a", "b") # Comptime-evaluated

main! = || {
    key = Stdin.line!() # Force runtime-evaluation

    match Dict.get(top_dict, key) {
        Ok(value) => Stdout.line!(value)
        Err(_) => Stdout.line!("missing")
    }
}

roc check and roc build both report no errors, but echo a | roc --no-cache main.roc prints:

missing

Expected: b.

Tested on NixOS, x86_64, Roc 1299a2ca8bbdf3fab1eb9ec65335df6b4fb5092d.