rewrite short-ice in rmake format

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -218,7 +218,6 @@ run-make/sepcomp-cci-copies/Makefile
 run-make/sepcomp-inlining/Makefile
 run-make/sepcomp-separate/Makefile
 run-make/share-generics-dylib/Makefile
-run-make/short-ice/Makefile
 run-make/silly-file-names/Makefile
 run-make/simd-ffi/Makefile
 run-make/split-debuginfo/Makefile

tests/run-make/short-ice/Makefile

@@ -1,10 +0,0 @@
-include ../tools.mk
-
-# ignore-windows
-
-export RUSTC := $(RUSTC_ORIGINAL)
-export LD_LIBRARY_PATH := $(HOST_RPATH_DIR)
-export TMPDIR := $(TMPDIR)
-
-all:
-	bash check.sh

tests/run-make/short-ice/check.sh

@@ -1,36 +0,0 @@
-#!/bin/sh
-export RUSTC_ICE=0
-RUST_BACKTRACE=1 $RUSTC src/lib.rs -Z treat-err-as-bug=1 1>$TMPDIR/rust-test-1.log 2>&1
-RUST_BACKTRACE=full $RUSTC src/lib.rs -Z treat-err-as-bug=1 1>$TMPDIR/rust-test-2.log 2>&1
-
-short=$(cat $TMPDIR/rust-test-1.log | wc -l)
-full=$(cat $TMPDIR/rust-test-2.log | wc -l)
-rustc_query_count=$(cat $TMPDIR/rust-test-1.log | grep rustc_query_ | wc -l)
-rustc_query_count_full=$(cat $TMPDIR/rust-test-2.log | grep rustc_query_ | wc -l)
-
-begin_count=$(cat $TMPDIR/rust-test-2.log | grep __rust_begin_short_backtrace | wc -l)
-end_count=$(cat $TMPDIR/rust-test-2.log | grep __rust_end_short_backtrace | wc -l)
-
-cat $TMPDIR/rust-test-1.log
-echo "====================="
-cat $TMPDIR/rust-test-2.log
-echo "====================="
-
-echo "short backtrace: $short"
-echo "full  backtrace: $full"
-echo "begin_count: $begin_count"
-echo "end_count  : $end_count"
-echo "rustc_query_count: $rustc_query_count"
-echo "rustc_query_count_full: $rustc_query_count_full"
-
-## backtraces to vary a bit depending on platform and configuration options,
-## here we make sure that the short backtrace of rustc_query is shorter than the full,
-## and marks are in pairs.
-if [ $short -lt $full ] &&
-    [ $begin_count -eq $end_count ] &&
-    [ $(($rustc_query_count + 5)) -lt $rustc_query_count_full ] &&
-    [ $rustc_query_count_full -gt 5 ]; then
-    exit 0
-else
-    exit 1
-fi

tests/run-make/short-ice/rmake.rs

@@ -0,0 +1,31 @@
+// Backtraces in internal compiler errors used to be unbearably long, spanning
+// multiple hundreds of lines. A fix was pushed in #108938, and this test gathers
+// varied metrics on level 1 and full-level backtraces to check that the output
+// was shortened down to an appropriate length.
+// See https://github.com/rust-lang/rust/issues/107910
+
+use run_make_support::rustc;
+use std::env;
+
+fn main() {
+    env::set_var("RUST_BACKTRACE", "1");
+    let mut rust_test_1 = rustc().input("src/lib.rs").arg("-Ztreat-err-as-bug=1").run_fail();
+    env::set_var("RUST_BACKTRACE", "full");
+    let mut rust_test_2 = rustc().input("src/lib.rs").arg("-Ztreat-err-as-bug=1").run_fail();
+    let rust_test_log_1 = rust_test_1.stderr_utf8().push_str(&rust_test_1.stdout_utf8()).as_str();
+    let rust_test_log_2 = rust_test_2.stderr_utf8().push_str(&rust_test_2.stdout_utf8()).as_str();
+
+    let rustc_query_count_full = count_lines_with(rust_test_log_2, "rustc_query_");
+
+    assert!(
+        rust_test_log_1.lines().count() < rust_test_log_2.lines().count()
+            && count_lines_with(rust_test_log_2, "__rust_begin_short_backtrace")
+                == count_lines_with(rust_test_log_2, "__rust_end_short_backtrace")
+            && count_lines_with(rust_test_log_1, "rustc_query_") + 5 < rustc_query_count_full
+            && rustc_query_count_full > 5
+    );
+}
+
+fn count_lines_with(s: &str, search: &str) -> usize {
+    s.lines().filter(|l| l.contains(search)).count()
+}