Files
modeling-app/docs/kcl
Adam Chalmers 6aa588f09f Bug: KCL formatter removes 'fn' from closures: (#4718)
# Problem

Before this PR, our formatter reformats
```
squares_out = reduce(arr, 0, fn (i, squares)  {
  return 1
})
```
to 
```
squares_out = reduce(arr, 0, (i, squares) {
  return 1
})
```
i.e. it removes the `fn` keyword from the closure. This keyword is required, so, our formatter turned working code into invalid code.

# Cause

When this closure parameter is formatted, the ExprContext is ::Decl, so `Expr::recast` skips adding the `fn` keyword. The reason it's ::Decl is because the `squares_out = ` declaration sets it, and no subsequent call sets the context to something else.

# Solution

When recasting a call expression, set the context for every argument to `ExprContext::Other`.
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