feat(formatter): hug trailing closures

[akonwi]

Summary

• keep a final multiline anonymous function attached to the call opening line when it fits
• retain the existing fully expanded call layout as the fallback
• make width-sensitive document choices account for enclosing indentation
• preserve expression documents until final rendering so nested groups see their actual context

Example

router.get("/fixtures/:id/outlook", fn(r: dram::Request, w: mut dram::Response) {
  handle_outlook(a, w, r)
})

The formatter falls back to one argument per line when the opening line exceeds 100 columns, a preceding argument is multiline, argument comments are present, or the final argument is not a nonempty anonymous function.

Validation

• cd compiler && go test ./formatter -count=1
• cd compiler && go test ./... -count=1
• formatted temporary copies of ../maestro/server/analysis.ard and ../dram/examples/hello/main.ard
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
ard-lang-dev	Ready	Preview, Comment	Jul 21, 2026 2:24am