Enum VmError 

pub enum VmError {
    StackUnderflow,
    TypeMismatch {
        expected: &'static str,
        got: &'static str,
    },
    UnboundVariable(String),
    DivisionByZero,
    InvalidInstruction(usize),
    ProgramEmpty,
}

Errors that can occur during VM execution.

Variants

StackUnderflow

A pop or peek was attempted on an empty stack.

TypeMismatch

An operation received a value of an unexpected type.

Fields

expected: &'static str

The type that was expected.

got: &'static str

The type that was actually present.

UnboundVariable(String)

A LoadVar instruction referenced a name not present in the environment.

DivisionByZero

A Div instruction was attempted with a zero denominator.

InvalidInstruction(usize)

The instruction pointer jumped outside the program bounds.

ProgramEmpty

execute was called with a program that contains no instructions.

Trait Implementations

impl Debug for VmError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for VmError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for VmError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.