Better error message for missing parameters

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835 stars (835 stars)

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Description

$ nix-instantiate -E "(import <nixpkgs> {}).buildEnv {}"
error: anonymous function at /nix/store/aaq585dv6ngsfhzx9bdq1ia0zgnlj322-nixos-18.09/nixos/pkgs/build-support/buildenv/default.nix:8:2 called without required argument 'name', at /nix/store/aaq585dv6ngsfhzx9bdq1ia0zgnlj322-nixos-18.09/nixos/lib/customisation.nix:69:12

$ ./result/bin/hnix --eval -E '(import <nixpkgs> {}).buildEnv {}' -I nix=$PWD/data/nix/corepkgs -I ~/dev/ --strict                                                                                                                                           
hnix: Missing value for parameter: "name"

Contributor guide

Research direction

Examine the code that handles missing function parameters in hnix and improve the error message to include the function name and its source location, similar to nix instantiate.

Tech stack

haskell

Domain

clitooling

Issue type

Bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

GitHaskell

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

75