Use GtkSourceView with Rust - rust

Question

I want to use GtkSourceView in my Rust app.
I've created the UI file using Glade. I had to install the component and link it.
This is my Rust code:
use gtk::prelude::*;
fn main() {
if gtk::init().is_err() {
println!("Failed to initialize GTK.");
return;
}
let glade_src = include_str!("user_interface.glade");
let builder = gtk::Builder::new_from_string(glade_src);
let window: gtk::Window = builder.get_object("main_window").unwrap();
window.show_all();
gtk::main();
}
...and the error I'm getting when I try cargo run:
alex#smartalex-bed:~/.repos/codelib/rust/venom$ cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.05s
Running `target/debug/venom`
(venom:10028): Gtk-ERROR **: 04:25:30.689: failed to add UI: .:17:1 Invalid object type 'GtkSourceView'
Trace/breakpoint trap (core dumped)
I found this and tried to include it in my Cargo.toml, however the error persists.
How can I use GtkSourceView in my Rust app?
This is user_interface.glade:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.22.2 -->
<interface>
<requires lib="gtk+" version="3.20"/>
<requires lib="gtksourceview" version="4.0"/>
<object class="GtkWindow" id="main_window">
<property name="can_focus">False</property>
<child type="titlebar">
<placeholder/>
</child>
<child>
<object class="GtkBox">
<property name="visible">True</property>
<property name="can_focus">False</property>
<child>
<object class="GtkSourceView">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="left_margin">2</property>
<property name="right_margin">2</property>
<property name="monospace">True</property>
<property name="show_line_numbers">True</property>
<property name="show_line_marks">True</property>
<property name="tab_width">4</property>
<property name="auto_indent">True</property>
<property name="insert_spaces_instead_of_tabs">True</property>
<property name="show_right_margin">True</property>
<property name="highlight_current_line">True</property>
<property name="smart_backspace">True</property>
</object>
<packing>
<property name="expand">True</property>
<property name="fill">True</property>
<property name="position">0</property>
</packing>
</child>
<child>
<placeholder/>
</child>
</object>
</child>
</object>
</interface>

Answer 1

I was able to run the program by adding following line:
sourceview::View::static_type();
The full example code:
use gtk::prelude::*;
fn main() {
if gtk::init().is_err() {
println!("Failed to initialize GTK.");
return;
}
sourceview::View::static_type();
let glade_src = include_str!("user_interface.glade");
let builder = gtk::Builder::new_from_string(glade_src);
let window: gtk::Window = builder.get_object("main_window").unwrap();
window.show_all();
gtk::main();
}
Further, Cargo.toml contains following dependencies:
[dependencies]
gtk = { version = "*", features = ["v3_22"] }
sourceview = "*"