fix test

compiler/rustc_errors/src/emitter.rs

@@ -1365,6 +1365,12 @@ impl HumanEmitter {
                     );
                     line += 1;
                 }
+                // We add lines above, but if the last line has no explicit newline (which would
+                // yield an empty line), then we revert one line up to continue with the next
+                // styled text chunk on the same line as the last one from the prior one. Otherwise
+                // every `text` would appear on their own line (because even though they didn't end
+                // in '\n', they advanced `line` by one).
+                line -= 1;
             }
             if self.short_message {
                 let labels = msp

tests/run-make/crate-loading/rmake.rs

@@ -13,19 +13,15 @@ fn main() {
         .input("multiple-dep-versions.rs")
         .extern_("dependency", rust_lib_name("dependency"))
         .extern_("dep_2_reexport", rust_lib_name("dependency2"))
-        .inspect(|cmd| eprintln!("{cmd:?}"))
-        .run_fail();
-    let stderr = out.stderr_utf8();
-    assert_contains(
-        &stderr,
-        "you have multiple different versions of crate `dependency` in your dependency graph",
-    );
-    assert_contains(
-        &stderr,
-        "two types coming from two different versions of the same crate are different types even \
-         if they look the same",
-    );
-    assert_contains(&stderr, "this type doesn't implement the required trait");
-    assert_contains(&stderr, "this type implements the required trait");
-    assert_contains(&stderr, "this is the required trait");
+        .run_fail()
+        .assert_stderr_contains(
+            "you have multiple different versions of crate `dependency` in your dependency graph",
+        )
+        .assert_stderr_contains(
+            "two types coming from two different versions of the same crate are different types \
+             even if they look the same",
+        )
+        .assert_stderr_contains("this type doesn't implement the required trait")
+        .assert_stderr_contains("this type implements the required trait")
+        .assert_stderr_contains("this is the required trait");
 }