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I have a file which contents are:

import Mathlib.Data.Rat.Basic

I save it as file.lean in a lean project and run it like this

lean --run .\file.lean

I get

.\file.lean:1:0: error: unknown package 'Mathlib'

but if I do

> ls .\lake-packages\    


    Directory: C:\fakepath\mathematics_in_lean\lake-packages


Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d-----        30.10.2023     01:25                aesop
d-----        30.10.2023     00:33                Cli
d-----        30.10.2023     01:24                mathlib
d-----        30.10.2023     01:24                proofwidgets
d-----        30.10.2023     01:25                Qq
d-----        30.10.2023     01:25                std

So it should work, right?

I don't want it to run on vscode, just run on the terminal.

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2 Answers 2

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I've had the same problem. It was crucial for me to run Lean code using terminal. After trial and error, this is the only way I've managed to do that:

  1. Go to the directory where your *.lean file is:
cd /path/to/lean_file/
  1. Run your *.lean file using this command:
lake env lean file_name.lean

This command works slow, but it does the job.

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To build a single file in a Lean project from the command line, you should be using lake build Path.To.File, which would build Path/To/File.lean.

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