Fix warnings for rust 1.87

jit/src/instructions.rs

@@ -1165,8 +1165,7 @@ impl<'a, 'b> FunctionCompiler<'a, 'b> {
 
         // ----- Merge: Return the final result.
         self.builder.switch_to_block(merge_block);
-        let final_val = self.builder.block_params(merge_block)[0];
-        final_val
+        self.builder.block_params(merge_block)[0]
     }
 
     fn compile_ipow(&mut self, a: Value, b: Value) -> Value {

jit/src/lib.rs

@@ -15,7 +15,13 @@ pub enum JitCompileError {
     #[error("bad bytecode")]
     BadBytecode,
     #[error("error while compiling to machine code: {0}")]
-    CraneliftError(#[from] ModuleError),
+    CraneliftError(Box<ModuleError>),
+}
+
+impl From<ModuleError> for JitCompileError {
+    fn from(err: ModuleError) -> Self {
+        Self::CraneliftError(Box::new(err))
+    }
 }
 
 #[derive(Debug, thiserror::Error, Eq, PartialEq)]

jit/tests/common.rs

@@ -78,7 +78,7 @@ impl StackMachine {
 
     pub fn run(&mut self, code: CodeObject) {
         let mut oparg_state = OpArgState::default();
-        code.instructions.iter().try_for_each(|&word| {
+        let _ = code.instructions.iter().try_for_each(|&word| {
             let (instruction, arg) = oparg_state.get(word);
             self.process_instruction(instruction, arg, &code.constants, &code.names)
         });