fix: check for cancun in cast run

crates/cast/bin/cmd/run.rs

@@ -117,25 +117,37 @@ impl RunArgs {
             .ok_or_else(|| eyre::eyre!("tx may still be pending: {:?}", tx_hash))?
             .to::<u64>();
 
+        // fetch the block the transaction was mined in
+        let block = provider.get_block(tx_block_number.into(), true).await?;
+
         // we need to fork off the parent block
         config.fork_block_number = Some(tx_block_number - 1);
 
         let (mut env, fork, chain) = TracingExecutor::get_fork_material(&config, evm_opts).await?;
 
-        let mut executor = TracingExecutor::new(env.clone(), fork, self.evm_version, self.debug);
+        let mut evm_version = self.evm_version;
 
         env.block.number = U256::from(tx_block_number);
 
-        let block = provider.get_block(tx_block_number.into(), true).await?;
         if let Some(ref block) = block {
             env.block.timestamp = block.header.timestamp;
             env.block.coinbase = block.header.miner;
             env.block.difficulty = block.header.difficulty;
             env.block.prevrandao = Some(block.header.mix_hash.unwrap_or_default());
             env.block.basefee = block.header.base_fee_per_gas.unwrap_or_default();
             env.block.gas_limit = block.header.gas_limit;
+
+            // TODO: we need a smarter way to map the block to the corresponding evm_version for
+            // commonly used chains
+            if evm_version.is_none() {
+                // if the block has the excess_blob_gas field, we assume it's a Cancun block
+                if block.header.excess_blob_gas.is_some() {
+                    evm_version = Some(EvmVersion::Cancun);
+                }
+            }
         }
 
+        let mut executor = TracingExecutor::new(env.clone(), fork, evm_version, self.debug);
         let mut env =
             EnvWithHandlerCfg::new_with_spec_id(Box::new(env.clone()), executor.spec_id());