Vendor things

third-party/vendor/backtrace/tests/long_fn_name.rs

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+use backtrace::Backtrace;
+
+// 50-character module name
+mod _234567890_234567890_234567890_234567890_234567890 {
+    // 50-character struct name
+    #[allow(non_camel_case_types)]
+    pub struct _234567890_234567890_234567890_234567890_234567890<T>(T);
+    impl<T> _234567890_234567890_234567890_234567890_234567890<T> {
+        #[allow(dead_code)]
+        pub fn new() -> crate::Backtrace {
+            crate::Backtrace::new()
+        }
+    }
+}
+
+// Long function names must be truncated to (MAX_SYM_NAME - 1) characters.
+// Only run this test for msvc, since gnu prints "<no info>" for all frames.
+#[test]
+#[cfg(all(windows, target_env = "msvc"))]
+fn test_long_fn_name() {
+    use _234567890_234567890_234567890_234567890_234567890::_234567890_234567890_234567890_234567890_234567890 as S;
+
+    // 10 repetitions of struct name, so fully qualified function name is
+    // atleast 10 * (50 + 50) * 2 = 2000 characters long.
+    // It's actually longer since it also includes `::`, `<>` and the
+    // name of the current module
+    let bt = S::<S<S<S<S<S<S<S<S<S<i32>>>>>>>>>>::new();
+    println!("{:?}", bt);
+
+    let mut found_long_name_frame = false;
+
+    for frame in bt.frames() {
+        let symbols = frame.symbols();
+        if symbols.is_empty() {
+            continue;
+        }
+
+        if let Some(function_name) = symbols[0].name() {
+            let function_name = function_name.as_str().unwrap();
+            if function_name.contains("::_234567890_234567890_234567890_234567890_234567890") {
+                found_long_name_frame = true;
+                assert!(function_name.len() > 200);
+            }
+        }
+    }
+
+    assert!(found_long_name_frame);
+}