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Mark _start as extern; fix wrong entry point name
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@@ -507,7 +507,7 @@ Now we can delete the `print_something` function and print directly from our `_s
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```rust
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// in src/main.rs
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#[no_mangle]
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pub fn _start() -> ! {
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pub extern fn _start() -> ! {
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use core::fmt::Write;
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vga_buffer::WRITER.lock().write_str("Hello again").unwrap();
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write!(vga_buffer::WRITER.lock(), ", some numbers: {} {}", 42, 1.337).unwrap();
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@@ -586,7 +586,7 @@ To use `println` in `main.rs`, we need to import the macros of the VGA buffer mo
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mod vga_buffer;
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#[no_mangle]
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pub extern fn rust_main() {
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pub extern fn _start() {
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println!("Hello World{}", "!");
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loop {}
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