Don't render multi-line literal values

Author: Veykril

src/tools/rust-analyzer/crates/ide/src/hover/render.rs

@@ -564,7 +564,13 @@ pub(super) fn literal(sema: &Semantics<'_, RootDatabase>, token: SyntaxToken) ->
 
     let mut s = format!("```rust\n{ty}\n```\n___\n\n");
     match value {
-        Ok(value) => format_to!(s, "value of literal: {value}"),
+        Ok(value) => {
+            if let Some(newline) = value.find('\n') {
+                format_to!(s, "value of literal (truncated up to newline): {}", &value[..newline])
+            } else {
+                format_to!(s, "value of literal: {value}")
+            }
+        }
         Err(error) => format_to!(s, "invalid literal: {error}"),
     }
     Some(s.into())

src/tools/rust-analyzer/crates/ide/src/hover/tests.rs

@@ -7814,6 +7814,28 @@ fn main() {
             value of literal: 🦀\u{1f980}\\\x41
         "#]],
     );
+    check(
+        r#"
+fn main() {
+    $0r"🦀\u{1f980}\\\x41
+
+
+fsdghs";
+}
+"#,
+        expect![[r#"
+            *r"🦀\u{1f980}\\\x41
+
+
+            fsdghs"*
+            ```rust
+            &str
+            ```
+            ___
+
+            value of literal (truncated up to newline): 🦀\u{1f980}\\\x41
+        "#]],
+    );
 }
 
 #[test]