Nickel evaluation failed for ncl/keymap-codegen.ncl

[aisuneko]

$ just test_keymap=keymap-48key-checkkeys dest_dir="firmware/ch32x035-usb-device-compositekm-c/libsmartkeymap/" install
cbindgen -c cbindgen.toml -o include/smart_keymap.h ./smart_keymap
WARN: Skip smart_keymap::KEYMAP - (not `no_mangle`).
env SMART_KEYMAP_CUSTOM_KEYMAP=tests/ncl/keymap-48key-checkkeys/keymap.ncl cargo build --release --package "smart_keymap" --target "riscv32imac-unknown-none-elf" --no-default-features
   Compiling smart-keymap-nickel-helper v0.9.0-dev (/home/aisuneko/src/git/smart-keymap/smart-keymap-nickel-helper)
   Compiling heapless v0.7.17
   Compiling heapless v0.8.0
   Compiling smart-keymap v0.9.0-dev (/home/aisuneko/src/git/smart-keymap)
error: failed to run custom build command for `smart-keymap v0.9.0-dev (/home/aisuneko/src/git/smart-keymap)`

Caused by:
  process didn't exit successfully: `/home/aisuneko/src/git/smart-keymap/target/release/build/smart-keymap-80628c32f5004352/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=SMART_KEYMAP_CUSTOM_KEYMAP
  cargo::rustc-check-cfg=cfg(custom_keymap)
  cargo:rerun-if-changed=/home/aisuneko/src/git/smart-keymap/target/riscv32imac-unknown-none-elf/release/build/smart-keymap-ad3d5db854610c4a/out/keymap.rs
  cargo:rustc-cfg=custom_keymap

  --- stderr

  thread 'main' panicked at smart-keymap-nickel-helper/src/lib.rs:345:21:
  Nickel evaluation failed: error: unexpected token
     ┌─ /home/aisuneko/src/git/smart-keymap/ncl/keymap-codegen.ncl:93:11
     │
  93 │           [] => {},
     │           ^
     │
     ┌─ <generated main>:1:2
     │
   1 │ ((import "keymap-codegen.ncl") & (import "keymap-ncl-to-json.ncl"))
     │  ----------------------------- imported here

  error: unexpected token
     ┌─ /home/aisuneko/src/git/smart-keymap/ncl/keymap-codegen.ncl:93:19
     │
  93 │           [] => {},
     │                   ^


  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: Recipe `build-keymap` failed on line 29 with exit code 101

Nickel version: nickel-lang-cli nickel 1.6.0 (rev 3441781d)

[rgoulter]

The version of nickel used by the devenv is 1.8.1:

$ nickel --version
nickel-lang-cli nickel 1.8.1 (rev cargore)

Either try with a more recent nickel version, or use the devenv to get the build dependencies.