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+error[E0580]: `main` function has wrong type
+ --> $DIR/extern-main-fn.rs:1:1
+ |
+LL | extern "C" fn main() {}
+ | ^^^^^^^^^^^^^^^^^^^^ expected "Rust" fn, found "C" fn
+ |
+ = note: expected fn pointer `fn()`
+ found fn pointer `extern "C" fn()`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0580`.