std: move "mod tests/benches" to separate files

Also doing fmt inplace as requested.

Author: tesuji

library/std/src/backtrace.rs

@@ -66,6 +66,9 @@
 
 #![unstable(feature = "backtrace", issue = "53487")]
 
+#[cfg(test)]
+mod tests;
+
 // NB: A note on resolution of a backtrace:
 //
 // Backtraces primarily happen in two steps, one is where we actually capture
@@ -438,55 +441,3 @@ impl RawFrame {
         }
     }
 }
-
-#[test]
-fn test_debug() {
-    let backtrace = Backtrace {
-        inner: Inner::Captured(Mutex::new(Capture {
-            actual_start: 1,
-            resolved: true,
-            frames: vec![
-                BacktraceFrame {
-                    frame: RawFrame::Fake,
-                    symbols: vec![BacktraceSymbol {
-                        name: Some(b"std::backtrace::Backtrace::create".to_vec()),
-                        filename: Some(BytesOrWide::Bytes(b"rust/backtrace.rs".to_vec())),
-                        lineno: Some(100),
-                    }],
-                },
-                BacktraceFrame {
-                    frame: RawFrame::Fake,
-                    symbols: vec![BacktraceSymbol {
-                        name: Some(b"__rust_maybe_catch_panic".to_vec()),
-                        filename: None,
-                        lineno: None,
-                    }],
-                },
-                BacktraceFrame {
-                    frame: RawFrame::Fake,
-                    symbols: vec![
-                        BacktraceSymbol {
-                            name: Some(b"std::rt::lang_start_internal".to_vec()),
-                            filename: Some(BytesOrWide::Bytes(b"rust/rt.rs".to_vec())),
-                            lineno: Some(300),
-                        },
-                        BacktraceSymbol {
-                            name: Some(b"std::rt::lang_start".to_vec()),
-                            filename: Some(BytesOrWide::Bytes(b"rust/rt.rs".to_vec())),
-                            lineno: Some(400),
-                        },
-                    ],
-                },
-            ],
-        })),
-    };
-
-    #[rustfmt::skip]
-    let expected = "Backtrace [\
-    \n    { fn: \"__rust_maybe_catch_panic\" },\
-    \n    { fn: \"std::rt::lang_start_internal\", file: \"rust/rt.rs\", line: 300 },\
-    \n    { fn: \"std::rt::lang_start\", file: \"rust/rt.rs\", line: 400 },\
-    \n]";
-
-    assert_eq!(format!("{:#?}", backtrace), expected);
-}

library/std/src/backtrace/tests.rs

@@ -0,0 +1,53 @@
+use super::*;
+
+#[test]
+fn test_debug() {
+    let backtrace = Backtrace {
+        inner: Inner::Captured(Mutex::new(Capture {
+            actual_start: 1,
+            resolved: true,
+            frames: vec![
+                BacktraceFrame {
+                    frame: RawFrame::Fake,
+                    symbols: vec![BacktraceSymbol {
+                        name: Some(b"std::backtrace::Backtrace::create".to_vec()),
+                        filename: Some(BytesOrWide::Bytes(b"rust/backtrace.rs".to_vec())),
+                        lineno: Some(100),
+                    }],
+                },
+                BacktraceFrame {
+                    frame: RawFrame::Fake,
+                    symbols: vec![BacktraceSymbol {
+                        name: Some(b"__rust_maybe_catch_panic".to_vec()),
+                        filename: None,
+                        lineno: None,
+                    }],
+                },
+                BacktraceFrame {
+                    frame: RawFrame::Fake,
+                    symbols: vec![
+                        BacktraceSymbol {
+                            name: Some(b"std::rt::lang_start_internal".to_vec()),
+                            filename: Some(BytesOrWide::Bytes(b"rust/rt.rs".to_vec())),
+                            lineno: Some(300),
+                        },
+                        BacktraceSymbol {
+                            name: Some(b"std::rt::lang_start".to_vec()),
+                            filename: Some(BytesOrWide::Bytes(b"rust/rt.rs".to_vec())),
+                            lineno: Some(400),
+                        },
+                    ],
+                },
+            ],
+        })),
+    };
+
+    #[rustfmt::skip]
+    let expected = "Backtrace [\
+    \n    { fn: \"__rust_maybe_catch_panic\" },\
+    \n    { fn: \"std::rt::lang_start_internal\", file: \"rust/rt.rs\", line: 300 },\
+    \n    { fn: \"std::rt::lang_start\", file: \"rust/rt.rs\", line: 400 },\
+    \n]";
+
+    assert_eq!(format!("{:#?}", backtrace), expected);
+}