Return correct error instead of panicking if requested resolc version doesn't exist

crates/compilers/src/compilers/resolc/compiler.rs

@@ -149,7 +149,14 @@ impl Resolc {
                     .filter(|x| _resolc_version.is_none_or(|version| version == x.version()))
                     .collect();
 
-                let binary = versions.into_iter().next_back().expect("Can't be empty");
+                let Some(binary) = versions.into_iter().next_back() else {
+                    let message = if let Some(v) = &_resolc_version {
+                        format!("`resolc` v{v} doesn't exist")
+                    } else {
+                        "No `resolc` versions available.".to_string()
+                    };
+                    return Err(SolcError::Message(message));
+                };
 
                 let binary_info = match binary {
                     Binary::Remote(binary_info) => binary_info,
@@ -346,7 +353,9 @@ impl Resolc {
             cmd.arg(&solc.solc);
             cmd.arg("--standard-json");
             let mut child = cmd.spawn().map_err(map_io_err(&self.resolc))?;
-            let mut stdin = io::BufWriter::new(child.stdin.take().unwrap());
+            let mut stdin = io::BufWriter::new(
+                child.stdin.take().ok_or(SolcError::msg("`resolc` `stdin` closed"))?,
+            );
             serde_json::to_writer(&mut stdin, &input)?;
             stdin.flush().map_err(map_io_err(&self.resolc))?;
             child
@@ -414,3 +423,23 @@ fn compile_output(output: Output) -> Result<Vec<u8>> {
         Err(SolcError::solc_output(&output))
     }
 }
+
+#[cfg(test)]
+#[cfg(feature = "full")]
+mod test {
+    use foundry_compilers_core::error::SolcError;
+
+    use super::Resolc;
+
+    #[test]
+    fn not_existing_version() {
+        let result = Resolc::install(
+            semver::Version::parse("0.1.0-dev.33").ok().as_ref(),
+            crate::solc::SolcCompiler::AutoDetect,
+        )
+        .expect_err("should fail");
+        assert!(
+            matches!(result, SolcError::Message(msg) if msg == "`resolc` v0.1.0-dev.33 doesn't exist")
+        )
+    }
+}