I recently added this to snakemake master

You can view, comment on, or merge this pull request online at:

  https://github.com/kyleam/snakemake-mode/pull/5

Commit Summary

• Add shadow keyword for rules

File Changes

• M snakemake-mode.el (2)

Patch Links:

• https://github.com/kyleam/snakemake-mode/pull/5.patch
• https://github.com/kyleam/snakemake-mode/pull/5.diff

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