The embedding examples panic with "Types ` File` does not start with an uppercase letter"

[bmitc]

Hello! I was excited to learn about Gluon today, but I want to check here before getting any further. Is this project active anymore?

From what I can tell, none of the examples in the embedding chapter of the book work: https://gluon-lang.org/doc/crates_io/book/embedding-api.html.

For example,

use gluon::{ThreadExt, new_vm};

fn main() {
    let vm = new_vm();
    let (result, _) = vm.run_expr::<i32>("example", "1 + 2").unwrap();
    assert_eq!(result, 3);
}

panics with

thread 'main' panicked at /Users/<user>/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/gluon_vm-0.18.2/src/api/record.rs:123:13:
Types ` File` does not start with an uppercase letter
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[Snarpix]

Use the latest version from master, by adding to cargo.toml

[patch.crates-io]
gluon = { git = "https://github.com/gluon-lang/gluon.git", rev = "6085b002e67fb473ab69fbd210433b0e8f7e7750" }

This commit fixes the issue:
41b9278