To download toolchains from Swift.org, use the Swiftly toolchain installer. Swift.org toolchains support Static Linux SDK, include experimental features like Embedded Swift and support for WebAssembly.

curl -O https://download.swift.org/swiftly/darwin/swiftly.pkg && \
installer -pkg swiftly.pkg -target CurrentUserHomeDirectory && \
~/.swiftly/bin/swiftly init --quiet-shell-followup && \
. "${SWIFTLY_HOME_DIR:-$HOME/.swiftly}/env.sh" && \
hash -r

curl -O https://download.swift.org/swiftly/darwin/swiftly.pkg && \
installer -pkg swiftly.pkg -target CurrentUserHomeDirectory && \
~/.swiftly/bin/swiftly init --quiet-shell-followup && \
set -q SWIFTLY_HOME_DIR && source "$SWIFTLY_HOME_DIR/env.fish" || source ~/.swiftly/env.fish

Swiftly

Swiftly supports installing development snapshot toolchains. For example, you can install the latest available snapshot for the next major release using the “main-snapshot” selector and prepare your code for when it arrives.

swiftly install main-snapshot

swiftly install 6.2-snapshot