print omitted frames count for short backtrace mode

Author: chenyukang

library/std/src/sys_common/backtrace.rs

@@ -60,6 +60,8 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
     bt_fmt.add_context()?;
     let mut idx = 0;
     let mut res = Ok(());
+    let mut omitted_count: usize = 0;
+    let mut first_omit = true;
     // Start immediately if we're not using a short backtrace.
     let mut start = print_fmt != PrintFmt::Short;
     backtrace_rs::trace_unsynchronized(|frame| {
@@ -85,10 +87,27 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
                         start = true;
                         return;
                     }
+                    if !start {
+                        omitted_count += 1;
+                    }
                 }
             }
 
             if start {
+                if omitted_count > 0 {
+                    debug_assert!(print_fmt == PrintFmt::Short);
+                    // only print the message between the middle of frames
+                    if !first_omit {
+                        let _ = writeln!(
+                            bt_fmt.formatter(),
+                            "      [... omitted {} frame{} ...]",
+                            omitted_count,
+                            if omitted_count > 1 { "s" } else { "" }
+                        );
+                    }
+                    first_omit = false;
+                    omitted_count = 0;
+                }
                 res = bt_fmt.frame().symbol(frame, symbol);
             }
         });

src/tools/build-manifest/Cargo.toml

@@ -8,7 +8,7 @@ toml = "0.5"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 anyhow = "1.0.32"
-flate2 = "1.0.16"
+flate2 = "1.0.26"
 xz2 = "0.1.7"
 tar = "0.4.29"
 sha2 = "0.10.1"

tests/ui/consts/const-eval/const-eval-query-stack.rs

@@ -10,7 +10,7 @@
 // normalize-stderr-test "\s\d{1,}: .*\n" -> ""
 // normalize-stderr-test "\s at .*\n" -> ""
 // normalize-stderr-test ".*note: Some details.*\n" -> ""
-
+// normalize-stderr-test ".*omitted \d{1,} frames.*\n" -> ""
 #![allow(unconditional_panic)]
 
 const X: i32 = 1 / 0; //~ERROR constant

tests/ui/panics/short-ice-remove-middle-frames-2.run.stderr

@@ -3,8 +3,10 @@ stack backtrace:
    0: std::panicking::begin_panic
    1: short_ice_remove_middle_frames_2::eight
    2: short_ice_remove_middle_frames_2::seven::{{closure}}
+      [... omitted 3 frames ...]
    3: short_ice_remove_middle_frames_2::fifth
    4: short_ice_remove_middle_frames_2::fourth::{{closure}}
+      [... omitted 4 frames ...]
    5: short_ice_remove_middle_frames_2::first
    6: short_ice_remove_middle_frames_2::main
    7: core::ops::function::FnOnce::call_once

tests/ui/panics/short-ice-remove-middle-frames.run.stderr

@@ -4,6 +4,7 @@ stack backtrace:
    1: short_ice_remove_middle_frames::seven
    2: short_ice_remove_middle_frames::sixth
    3: short_ice_remove_middle_frames::fifth::{{closure}}
+      [... omitted 4 frames ...]
    4: short_ice_remove_middle_frames::second
    5: short_ice_remove_middle_frames::first::{{closure}}
    6: short_ice_remove_middle_frames::first