Who contributed to Elixir & Phoenix on August 9, 2026?

1 developer shipped this update, including makoto-developer.

What were the notable Elixir & Phoenix updates?

Only use do-end blocks when every trailing keyword is a block keyword and Only use do-end blocks when every trailing keyword is a block keyword (#15725).

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MACRO.TO_STRING BUG BREAKS FOR COMPREHENSIONS WITH TRAILING KEYWORDS

By RepoJournal · Filed 06:59 UTC on August 9, 2026 · About Elixir & Phoenix

1 person shipped this

makoto-developer @makoto-developer 2 cited

Elixir's Macro.to_string/1 silently corrupts for-comprehensions that use do-end blocks with non-block trailing keywords, rendering valid code that no longer compiles.

When Macro.to_string/1 encounters a trailing keyword list starting with do:, it renders the entire expression as a do-end block regardless of what comes after [1]. This breaks code like for(cp <- gc, do: <<cp::utf8>>, into: "") by parsing into as a bare variable instead of a comprehension option [1]. The rendered output looks syntactically valid but fails to compile, turning a silent macro bug into a runtime trap [2]. The fix restricts do-end block rendering to cases where every trailing keyword is actually a block keyword, preserving the semantic meaning of the original quoted expression [2]. This lands as a single commit across the Elixir repo over the last 24 hours.

Action items

→ Pull latest Elixir main if you work with for-comprehensions and Macro.to_string elixir-lang/elixir [plan]
→ Audit any macros that quote for-comprehensions with into: or other trailing keywords elixir-lang/elixir [monitor]

References

[1] Only use do-end blocks when every trailing keyword is a block keyword ↗ elixir-lang/elixir
[2] Only use do-end blocks when every trailing keyword is a block keyword (#15725) elixir-lang/elixir

Quick answers

What shipped in Elixir & Phoenix on August 9, 2026?: Elixir's Macro.to_string/1 silently corrupts for-comprehensions that use do-end blocks with non-block trailing keywords, rendering valid code that no longer compiles. In total, 1 commits and 1 pull requests landed.
Who contributed to Elixir & Phoenix on August 9, 2026?: 1 developer shipped this update, including makoto-developer.
What were the notable Elixir & Phoenix updates?: Only use do-end blocks when every trailing keyword is a block keyword and Only use do-end blocks when every trailing keyword is a block keyword (#15725).

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