This example demonstrates Fe contract reverts that Foundry decodes like standard Solidity payloads:

• checked arithmetic overflow emits Panic(0x11), displayed as panic: arithmetic underflow or overflow (0x11)
• assert!(false) emits Panic(0x01), displayed as panic: assertion failed (0x01)
• assert!(false, "boom") emits Error(string), displayed as boom

Run:

FE_BIN="$HOME/code/fe/master/target/release/fe" forge test -vv

To see Foundry's decoded failure output directly, run the opt-in display tests. These intentionally fail:

FE_BIN="$HOME/code/fe/master/target/release/fe" forge test --match-test test_display --no-match-test '^$' -vvv