Mist — Rust with ergonomics

New Features

Virtual Methods

The virtual keyword enables polymorphic dispatch through vtables. Methods marked virtual can be overridden in subclasses and will be dispatched dynamically at runtime:

pub class Animal
{
    pub virtual void speak(&self)
    {
        println!("...");
    }
}

class Dog : Animal
{
    void speak(&self) override
    {
        println!("Woof!");
    }
}

Array Types

Fixed-size array types are now supported with [T; N] syntax:

[i32; 10] numbers;    // Array of 10 i32s
[str&; 3] names;      // Array of 3 string references

Tuple Variable Declarations

Tuple variables can now be declared with explicit type annotations using as:

(i32, bool) as x, y = (1, true);

i32 a, b = (1, 2, 3);

Include Directives

C-style include directives for importing external files and crates:

#include <stdio.h>           // Global include
pub use my_crate::module;    // Use include
#include "local.mist"        // Local include

Syntax Changes

Allman Style Struct/Enum Fields

Struct and enum fields now use semicolons instead of commas:

// Before (v0.3.x)
struct Point { i32 x, i32 y }

// After (v0.4.0)
struct Point { i32 x; i32 y; }

Bug Fixes

Fixed default initializers in classes
Fixed the mapping system for error remapping
Fixed include manifest path resolution
Fixed various analyzer bugs
Fixed the publish command
Fixed completion pollution in LSP

Improvements

Updated bootstrap infrastructure
Migrated to core library for c_void and classes
Removed unnecessary lifetime annotations
Fixed generics and function type handling