331 each second projection refused

✓ Passing Passing: the compiler rejects this program as expected.

Code

// One `{ ... }` produce stage per `! each` arm: `{ f } { g }` is refused
// until the stage-list grammar lands — each `{ }` replaces the downstream
// scope, so a second stage is a different grammar than two adjacent braces
// suggest.
import std/io

for(1..4)
    ! each i { double: i * 2 } { triple: double * 3 } |> std/io:print.ln("{{ triple:d }}")

input.k

Actual compiler output

error[PARSE001]: Second projection stage in one arm — one `{ ... }` produce per `! each` arm for now.
  --> tests/regression/200_COMPILER_FEATURES/210_PARSER/210_331_each_second_projection_refused/input.k:8:6
    |
  8 |     ! each i { double: i * 2 } { triple: double * 3 } |> std/io:print.ln("{{ triple:d }}")
    |      ^

Frontend must reject with:

CONTAINS error[PARSE001]
CONTAINS Second projection stage
NOT_CONTAINS output_emitted.zig

Test Configuration

MUST_ERROR

← 330 each produce redundant rename refused 332 midline branch arm refused →