Compiler testing

[delvedor]

The compiler is easy to maintain, but given that the complexity is beginning to grow, it's a good idea to have a set of tests that verify the compiler's functionality.
This pr adds the infrastructure for doing so and an initial set of basic tests.

[github-actions]

The backport to 8.0 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.0 8.0
# Navigate to the new working tree
cd .worktrees/backport-8.0
# Create a new branch
git switch --create backport-1547-to-8.0
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 1a56e28b1787555d4cf7e4b95880167266644779
# Push it to GitHub
git push --set-upstream origin backport-1547-to-8.0
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.0

Then, create a pull request where the base branch is 8.0 and the compare/head branch is backport-1547-to-8.0.

[github-actions]

The backport to 8.1 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.1 8.1
# Navigate to the new working tree
cd .worktrees/backport-8.1
# Create a new branch
git switch --create backport-1547-to-8.1
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 1a56e28b1787555d4cf7e4b95880167266644779
# Push it to GitHub
git push --set-upstream origin backport-1547-to-8.1
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.1

Then, create a pull request where the base branch is 8.1 and the compare/head branch is backport-1547-to-8.1.

[github-actions]

The backport to 8.2 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.2 8.2
# Navigate to the new working tree
cd .worktrees/backport-8.2
# Create a new branch
git switch --create backport-1547-to-8.2
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 1a56e28b1787555d4cf7e4b95880167266644779
# Push it to GitHub
git push --set-upstream origin backport-1547-to-8.2
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.2

Then, create a pull request where the base branch is 8.2 and the compare/head branch is backport-1547-to-8.2.