From 3fda7086cc810ce3003b91f74eb1c17e9f016319 Mon Sep 17 00:00:00 2001
From: Wesley Wiser <wesleywiser@microsoft.com>
Date: Wed, 28 Jul 2021 11:40:53 -0400
Subject: [PATCH] Add regression test

---
 .../panic-short-backtrace-windows-x86_64.rs   | 44 +++++++++++++++++++
 ...-short-backtrace-windows-x86_64.run.stderr |  3 ++
 2 files changed, 47 insertions(+)
 create mode 100644 src/test/ui/panics/panic-short-backtrace-windows-x86_64.rs
 create mode 100644 src/test/ui/panics/panic-short-backtrace-windows-x86_64.run.stderr

diff --git a/src/test/ui/panics/panic-short-backtrace-windows-x86_64.rs b/src/test/ui/panics/panic-short-backtrace-windows-x86_64.rs
new file mode 100644
index 00000000000..eae3f861519
--- /dev/null
+++ b/src/test/ui/panics/panic-short-backtrace-windows-x86_64.rs
@@ -0,0 +1,44 @@
+// Regression test for #87481: short backtrace formatting cut off the entire stack trace.
+
+// Codegen-units is specified here so that we can replicate a typical rustc invocation which
+// is not normally limited to 1 CGU. This is important so that the `__rust_begin_short_backtrace`
+// and `__rust_end_short_backtrace` symbols are not marked internal to the CGU and thus will be
+// named in the symbol table.
+// compile-flags: -O -Ccodegen-units=8
+
+// run-fail
+// check-run-results
+// exec-env:RUST_BACKTRACE=1
+
+// Backtraces are pretty broken in general on i686-pc-windows-msvc (#62897).
+// only-x86_64-pc-windows-msvc
+
+fn main() {
+    a();
+}
+
+// Make these no_mangle so dbghelp.dll can figure out the symbol names.
+
+#[no_mangle]
+#[inline(never)]
+fn a() {
+    b();
+}
+
+#[no_mangle]
+#[inline(never)]
+fn b() {
+    c();
+}
+
+#[no_mangle]
+#[inline(never)]
+fn c() {
+    d();
+}
+
+#[no_mangle]
+#[inline(never)]
+fn d() {
+    panic!("d was called");
+}
diff --git a/src/test/ui/panics/panic-short-backtrace-windows-x86_64.run.stderr b/src/test/ui/panics/panic-short-backtrace-windows-x86_64.run.stderr
new file mode 100644
index 00000000000..f855346532f
--- /dev/null
+++ b/src/test/ui/panics/panic-short-backtrace-windows-x86_64.run.stderr
@@ -0,0 +1,3 @@
+thread 'main' panicked at 'd was called', $DIR/panic-short-backtrace-windows-x86_64.rs:43:5
+stack backtrace:
+note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
-- 
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