What's New in v1.11

"The Developer Experience Release" - make developers productive in their first hour.

Highlights

• enum.to_string() returns "Red", not "0"
• for i, v in arr - indexed iteration like Python and Go
• "ha" * 3 - string repeat operator
• int? - optional type syntax sugar
• wyn test - cross-platform test runner (no shell required)
• wyn fmt - code formatter with --check for CI
• Missing return is now an error - no more silent garbage values
• Type errors from Wyn - clear messages with line numbers, not cryptic C errors

Language Features

Enum to_string

enum Color { Red, Green, Blue }

print(Color.Red.to_string())   // "Red" (was "0" in v1.10)

var c = Color.Green
print(c.to_string())           // "Green"

Indexed Iteration

var fruits = ["apple", "banana", "cherry"]
for i, v in fruits {
    print(i.to_string() + ": " + v)
}
// 0: apple
// 1: banana
// 2: cherry

String Repeat

print("ha" * 3)       // "hahaha"
print("-" * 40)        // separator line

Optional Type Syntax

var x: int? = OptionInt_Some(42)
var y: int? = OptionInt_None()
print(OptionInt_unwrap(x).to_string())  // 42

Compiler Improvements

Missing Return is an Error

fn get() -> int {
    // v1.10: Warning (returns garbage at runtime)
    // v1.11: Error - compilation fails
}

Type Mismatch Errors from Wyn

var x: int = "hello"
// Error: Type mismatch at line 1
//   Expected: int (integer)
//   Got:      string (text string)
//   Suggestion: use .to_int() to parse the string

Typed Arrays

var arr: [int] = [] now uses a specialized WynIntArray with raw long long* storage - no type tags, no boxing. Building and summing a 1M-element int array takes ~11ms.

Tooling

wyn test

Cross-platform test runner using direct process spawning. No shell, no system() calls. Works on macOS, Linux, and Windows.

$ wyn test tests/expect
🧪 Wyn Test Runner
  ✓ test_enums.wyn (0.1s)
  ✓ test_structs.wyn (0.1s)
  ✓ test_string_methods.wyn (0.1s)

Results: 21 passed, 0 failed (0.3s)
🎉 All tests passed!

wyn fmt

wyn fmt file.wyn          # format in place
wyn fmt --check src/      # CI mode - exit 1 if unformatted

Style: 4-space indent, no semicolons, braces on same line.

Metrics

Metric	v1.10	v1.11
Unit tests	110	110
BDD tests	32	36
Binary size (--release)	50KB	50KB
fib(35)	41ms	41ms
Official packages	31	36

Upgrading

curl -fsSL https://wynlang.com/install.sh | sh
wyn --version  # should show 1.11.0

No breaking changes. All v1.10 code compiles without modification, except:

• Functions with missing returns that previously compiled with a warning will now fail. Add the missing return statement.
• enum.to_string() now returns the variant name instead of the integer value. If you relied on the integer string, use int_to_string() directly.

Previous Releases

• What's New in v1.10 - zero leaks, faster strings
• What's New in v1.9 - generators, debugger, 36 packages