Report span of test when should_panic test failed

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>

library/test/src/test_result.rs

@@ -77,7 +77,12 @@ pub(crate) fn calc_result(
 
         // The test should have panicked, but didn't panic.
         (ShouldPanic::Yes, None) | (ShouldPanic::YesWithMessage(_), None) => {
-            TestResult::TrFailedMsg("test did not panic as expected".to_string())
+            let fn_location = if !desc.source_file.is_empty() {
+                &format!(" at {}:{}:{}", desc.source_file, desc.start_line, desc.start_col)
+            } else {
+                ""
+            };
+            TestResult::TrFailedMsg(format!("test did not panic as expected{}", fn_location))
         }
 
         // The test should not have panicked, but did panic.

tests/rustdoc-ui/doctest/failed-doctest-should-panic.stdout

@@ -5,7 +5,7 @@ test $DIR/failed-doctest-should-panic.rs - Foo (line 10) - should panic ... FAIL
 failures:
 
 ---- $DIR/failed-doctest-should-panic.rs - Foo (line 10) stdout ----
-note: test did not panic as expected
+note: test did not panic as expected at $DIR/failed-doctest-should-panic.rs:10:0
 
 failures:
     $DIR/failed-doctest-should-panic.rs - Foo (line 10)

tests/ui/test-attrs/test-should-panic-failed-show-span.rs

@@ -0,0 +1,42 @@
+//@ run-fail
+//@ check-run-results
+//@ compile-flags: --test
+//@ exec-env:RUST_BACKTRACE=0
+//@ normalize-stdout: "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ run-flags: --test-threads=1
+
+#[test]
+#[should_panic]
+fn should_panic_with_any_message() {
+    panic!("Panic!");
+}
+
+#[test]
+#[should_panic = "message"]
+fn should_panic_with_message() {
+    panic!("message");
+}
+
+#[test]
+#[should_panic]
+fn should_panic_with_any_message_does_not_panic() {
+    // DON'T PANIC
+}
+
+#[test]
+#[should_panic = "message"]
+fn should_panic_with_message_does_not_panic() {
+    // DON'T PANIC
+}
+
+#[test]
+#[should_panic = "message"]
+fn should_panic_with_substring_panics_with_incorrect_string() {
+    panic!("ZOMGWTFBBQ");
+}
+
+#[test]
+#[should_panic = "message"]
+fn should_panic_with_substring_panics_with_non_string_value() {
+    panic!(123); //~ WARNING panic message is not a string literal
+}

tests/ui/test-attrs/test-should-panic-failed-show-span.run.stdout

@@ -0,0 +1,38 @@
+
+running 6 tests
+test should_panic_with_any_message - should panic ... ok
+test should_panic_with_any_message_does_not_panic - should panic ... FAILED
+test should_panic_with_message - should panic ... ok
+test should_panic_with_message_does_not_panic - should panic ... FAILED
+test should_panic_with_substring_panics_with_incorrect_string - should panic ... FAILED
+test should_panic_with_substring_panics_with_non_string_value - should panic ... FAILED
+
+failures:
+
+---- should_panic_with_any_message_does_not_panic stdout ----
+note: test did not panic as expected at $DIR/test-should-panic-failed-show-span.rs:22:4
+---- should_panic_with_message_does_not_panic stdout ----
+note: test did not panic as expected at $DIR/test-should-panic-failed-show-span.rs:28:4
+---- should_panic_with_substring_panics_with_incorrect_string stdout ----
+
+thread 'should_panic_with_substring_panics_with_incorrect_string' panicked at $DIR/test-should-panic-failed-show-span.rs:35:5:
+ZOMGWTFBBQ
+note: panic did not contain expected string
+      panic message: `"ZOMGWTFBBQ"`,
+ expected substring: `"message"`
+---- should_panic_with_substring_panics_with_non_string_value stdout ----
+
+thread 'should_panic_with_substring_panics_with_non_string_value' panicked at $DIR/test-should-panic-failed-show-span.rs:41:5:
+Box<dyn Any>
+note: expected panic with string value,
+ found non-string value: `TypeId(0x56ced5e4a15bd89050bb9674fa2df013)`
+     expected substring: `"message"`
+
+failures:
+    should_panic_with_any_message_does_not_panic
+    should_panic_with_message_does_not_panic
+    should_panic_with_substring_panics_with_incorrect_string
+    should_panic_with_substring_panics_with_non_string_value
+
+test result: FAILED. 2 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+

tests/ui/test-attrs/test-should-panic-failed-show-span.stderr

@@ -0,0 +1,21 @@
+warning: panic message is not a string literal
+  --> $DIR/test-should-panic-failed-show-span.rs:41:12
+   |
+LL |     panic!(123);
+   |            ^^^
+   |
+   = note: this usage of `panic!()` is deprecated; it will be a hard error in Rust 2021
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/panic-macro-consistency.html>
+   = note: `#[warn(non_fmt_panics)]` on by default
+help: add a "{}" format string to `Display` the message
+   |
+LL |     panic!("{}", 123);
+   |            +++++
+help: or use std::panic::panic_any instead
+   |
+LL -     panic!(123);
+LL +     std::panic::panic_any(123);
+   |
+
+warning: 1 warning emitted
+