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 }

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

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

Indexed Iteration

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

String Repeat

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

Optional Type Syntax

var x: int? = OptionInt_Some(42)
var y: int? = OptionInt_None()
println(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. Sum of 1M ints is 2x faster.

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	49KB	49KB
fib(35)	33ms	34ms
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, 2024x faster strings
• What's New in v1.9 — generators, debugger, 36 packages