How do I install the Julia Syntax Lowering skill?

Run npx skillmds@latest add julialang/julia-syntax-lowering in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Julia Syntax Lowering safe to use?

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Is Julia Syntax Lowering free to use?

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Who published Julia Syntax Lowering?

julialang (@julialang) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Julia Syntax Lowering by julialang — Agent Skill

Name: Julia Syntax Lowering
Author: julialang

File contents

JuliaSyntax & JuliaLowering development

Use this when modifying JuliaSyntax/ or JuliaLowering/ source, tests, or package metadata.

Testing JuliaSyntax

Run package tests from the repository root:

julia --project=JuliaSyntax -e 'using Pkg; Pkg.test()'

JuliaSyntax is not tied only to the in-tree Julia runtime; if a change may be version-sensitive, test it with the relevant installed Julia version(s).

Testing JuliaLowering

Prefer the in-tree Julia runtime because compatibility with the Julia runtime may matter:

./usr/bin/julia --project=JuliaLowering -e 'using Pkg; Pkg.test()'

If ./usr/bin/julia is unavailable, note that limitation and use an available julia executable only for preliminary validation.

In this repository, JuliaLowering/Project.toml points its JuliaSyntax dependency at the sibling JuliaSyntax checkout (path = "../JuliaSyntax"). Therefore, JuliaSyntax changes can affect JuliaLowering. When a JuliaSyntax change may affect lowering behavior or syntax data consumed by JuliaLowering, run the JuliaLowering test command as well.

Targeted JuliaLowering tests

For targeted JuliaLowering test execution, include JuliaLowering/test/utils.jl before the test file, matching JuliaLowering/test/runtests.jl:

./usr/bin/julia --project=JuliaLowering -e 'cd("JuliaLowering/test") do; include("utils.jl"); include("scopes.jl"); end'

For _ir.jl fixtures, call test_ir_cases after loading utils.jl:

./usr/bin/julia --project=JuliaLowering -e 'cd("JuliaLowering/test") do; include("utils.jl"); test_ir_cases("scopes_ir.jl"); end'

Trying JuliaLowering execution

For quick execution checks, run with the in-tree Julia runtime and the JuliaLowering project:

./usr/bin/julia --project=JuliaLowering

Then either evaluate code explicitly through JuliaLowering:

using JuliaLowering
JuliaLowering.include_string(Main, "1 + 2")

or activate JuliaLowering as the process lowerer, then evaluate subsequent code normally:

using JuliaLowering
JuliaLowering.activate!()

1 + 2

Use include("path/to/file.jl") after activation when checking a file. When using JuliaLowering.activate!() from -e, make the code under test a separate top-level statement after activation, or put it in include(...).

---name: julia-syntax-loweringdescription: Develop and test JuliaSyntax and JuliaLowering in Julia's source tree. Use when modifying JuliaSyntax/ or JuliaLowering/, running package or targeted tests, or checking JuliaLowering execution.---# JuliaSyntax & JuliaLowering developmentUse this when modifying `JuliaSyntax/` or `JuliaLowering/` source, tests, orpackage metadata.## Testing JuliaSyntaxRun package tests from the repository root:```shjulia --project=JuliaSyntax -e 'using Pkg; Pkg.test()'````JuliaSyntax` is not tied only to the in-tree Julia runtime; if a change may beversion-sensitive, test it with the relevant installed Julia version(s).## Testing JuliaLoweringPrefer the in-tree Julia runtime because compatibility with the Julia runtimemay matter:```sh./usr/bin/julia --project=JuliaLowering -e 'using Pkg; Pkg.test()'```If `./usr/bin/julia` is unavailable, note that limitation and use an available`julia` executable only for preliminary validation.In this repository, `JuliaLowering/Project.toml` points its `JuliaSyntax`dependency at the sibling `JuliaSyntax` checkout(`path = "../JuliaSyntax"`). Therefore, `JuliaSyntax` changes can affect`JuliaLowering`. When a `JuliaSyntax` change may affect lowering behavior orsyntax data consumed by `JuliaLowering`, run the `JuliaLowering` test command aswell.### Targeted JuliaLowering testsFor targeted `JuliaLowering` test execution, include`JuliaLowering/test/utils.jl` before the test file, matching`JuliaLowering/test/runtests.jl`:```sh./usr/bin/julia --project=JuliaLowering -e 'cd("JuliaLowering/test") do; include("utils.jl"); include("scopes.jl"); end'```For `_ir.jl` fixtures, call `test_ir_cases` after loading `utils.jl`:```sh./usr/bin/julia --project=JuliaLowering -e 'cd("JuliaLowering/test") do; include("utils.jl"); test_ir_cases("scopes_ir.jl"); end'```## Trying JuliaLowering executionFor quick execution checks, run with the in-tree Julia runtime and the`JuliaLowering` project:```sh./usr/bin/julia --project=JuliaLowering```Then either evaluate code explicitly through `JuliaLowering`:```juliausing JuliaLoweringJuliaLowering.include_string(Main, "1 + 2")```or activate `JuliaLowering` as the process lowerer, then evaluate subsequentcode normally:```juliausing JuliaLoweringJuliaLowering.activate!()1 + 2```Use `include("path/to/file.jl")` after activation when checking a file. Whenusing `JuliaLowering.activate!()` from `-e`, make the code under test a separatetop-level statement after activation, or put it in `include(...)`.

Frequently asked questions

Julia Syntax Lowering