WIP: snapshot test for #72550

src/test/run-make-fulldeps/issue-72550/Makefile

@@ -0,0 +1,33 @@
+-include ../tools.mk
+
+
+ifeq ($(UNAME),Darwin)
+SNAPSHOT_NAME := apple.stderr
+else
+ifdef IS_WINDOWS
+# TODO: Actually get the line numbers for windows and linux
+# TODO: Find a way to prevent the snapshot from changing every time the
+#       implementation files chage. Probably using `sed` or `cat-and-grep`?
+SNAPSHOT_NAME := windows.stderr
+else
+# TODO: which other platforms use this branch?
+SNAPSHOT_NAME := linux.stderr
+endif
+endif
+
+ifdef BLESS
+COMPARE_SNAPSHOTS := echo "updating snapshot $(SNAPSHOT_NAME)" && mv $(TMPDIR)/panic.stderr.actual $(SNAPSHOT_NAME)
+else
+COMPARE_SNAPSHOTS := diff -u $(TMPDIR)/panic.stderr.actual $(SNAPSHOT_NAME) \
+	|| ( \
+		echo "stderr does not match snapshot $(SNAPSHOT_NAME)." && \
+		echo "Re-run with BLESS=1 to update." && \
+		exit 1 \
+	)
+endif
+
+
+all:
+	$(RUSTC) $(COMPILE_FLAGS) test.rs
+	RUST_BACKTRACE=1 $(call RUN,test) 2> $(TMPDIR)/panic.stderr.actual && exit 1 || exit 0
+	$(COMPARE_SNAPSHOTS)

src/test/run-make-fulldeps/issue-72550/apple.stderr

@@ -0,0 +1,15 @@
+thread 'main' panicked at 'explicit panic', test.rs:2:5
+stack backtrace:
+   0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
+   1: core::fmt::write
+   2: std::io::Write::write_fmt
+   3: std::panicking::default_hook::{{closure}}
+   4: std::panicking::default_hook
+   5: std::panicking::rust_panic_with_hook
+   6: std::panicking::begin_panic
+   7: test::main
+   8: std::rt::lang_start::{{closure}}
+   9: std::rt::lang_start_internal
+  10: std::rt::lang_start
+  11: main
+note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

src/test/run-make-fulldeps/issue-72550/linux.stderr

@@ -0,0 +1,17 @@
+thread 'main' panicked at 'explicit panic', test.rs:2:5
+stack backtrace:
+   0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
+   1: core::fmt::write
+   2: std::io::Write::write_fmt
+   3: std::panicking::default_hook::{{closure}}
+   4: std::panicking::default_hook
+   5: std::panicking::rust_panic_with_hook
+   6: std::panicking::begin_panic
+   7: test::main
+   8: std::rt::lang_start::{{closure}}
+   9: std::rt::lang_start_internal
+  10: std::rt::lang_start
+  11: main
+  12: __libc_start_main
+  13: _start
+note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

src/test/run-make-fulldeps/issue-72550/test.rs

@@ -0,0 +1,3 @@
+fn main() {
+    panic!();
+}

src/test/run-make-fulldeps/issue-72550/windows.stderr

@@ -0,0 +1,15 @@
+thread 'main' panicked at 'explicit panic', test.rs:2:5
+stack backtrace:
+   0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
+   1: core::fmt::write
+   2: std::io::Write::write_fmt
+   3: std::panicking::default_hook::{{closure}}
+   4: std::panicking::default_hook
+   5: std::panicking::rust_panic_with_hook
+   6: std::panicking::begin_panic
+   7: test::main
+   8: std::rt::lang_start::{{closure}}
+   9: std::rt::lang_start_internal
+  10: std::rt::lang_start
+  11: main
+note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.