What changed in Go, Rust and Solidity this week.

// This program demonstrates the new sticky‑bit handling on *BSD and Solaris.
// It attempts to create a file with the sticky bit set. On systems that
// support the sticky bit, the file is created successfully. On systems
// that do not, an error is returned. The GODEBUG flag can be set to
// restore the old behavior, but it is not used here.

package main

import (
	"fmt"
	"os"
)

func main() {
	// Attempt to create a file with the sticky bit.
	f, err := os.OpenFile("sticky_test.txt", os.O_CREATE|os.O_RDWR, os.FileMode(0o644|os.ModeSticky))
	if err != nil {
		fmt.Printf("Error creating file with sticky bit: %v\n", err)
		return
	}
	defer f.Close()
	fmt.Println("File created successfully with sticky bit set (if supported).")
}

// This program demonstrates the announcement of the rustwasm org being archived.
// It simply prints the key dates and the repository that will be transferred.
fn main() {
    // The rustwasm organization will be fully archived in September 2025.
    println!("rustwasm org will be archived in September 2025.");

    // The wasm-bindgen repository will be moved to a new organization shortly after July 21, 2025.
    println!("wasm-bindgen will be transferred to a new organization soon after July 21, 2025.");
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.37;

// This contract demonstrates that delete on a memory bytes array element
// clears only the targeted byte, not the whole 32‑byte word.
contract Main {
    function clearByte(uint index) external pure returns (bytes memory) {
        bytes memory data = new bytes(5);
        // set all bytes to 0xFF for visibility
        for (uint i = 0; i < data.length; i++) {
            data[i] = 0xFF;
        }
        // delete the element at `index`
        delete data[index];
        return data;
    }
}

Tests

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.37;

import "./main.sol";

contract MainTest {
    Main main;

    constructor() {
        main = new Main();
    }

    function test_singleByteCleared() public {
        bytes memory result = main.clearByte(2);
        // bytes[2] should be 0x00, others remain 0xFF
        require(result[2] == 0x00, "byte not cleared");
        require(result[0] == 0xFF, "other byte altered");
        require(result[1] == 0xFF, "other byte altered");
        require(result[3] == 0xFF, "other byte altered");
        require(result[4] == 0xFF, "other byte altered");
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.37;

// This contract demonstrates the 0.8.37 delete‑byte‑array‑element fix.
// It creates a memory bytes array, sets each element to 0x01,
// deletes the middle element, and returns the array.
contract Demo {
    function deleteMiddle() external pure returns (bytes memory) {
        bytes memory b = new bytes(3);
        b[0] = 0x01;
        b[1] = 0x01;
        b[2] = 0x01;
        delete b[1]; // only b[1] should become 0x00
        return b;
    }
}

Tests

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.37;
import "./main.sol";

contract DemoTest {
    Demo demo;

    constructor() {
        demo = new Demo();
    }

    function test_deleteLeavesOtherBytes() external {
        bytes memory result = demo.deleteMiddle();
        require(result.length == 3, "wrong length");
        require(result[0] == 0x01, "b[0] altered");
        require(result[1] == 0x00, "b[1] not zeroed");
        require(result[2] == 0x01, "b[2] altered");
    }
}