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    Tools

    fb check

    Checks a program for errors, without building it.

    fb check [options] [file.fb | package folder]

    fb check reads a program and every module it imports, and reports each error and warning, without generating code. It’s the fastest way to know whether a program compiles. With no file or folder, it works on the package the current folder is in: the nearest folder, from the current one up, with a project.toml.

    Options

    Option
    --releaseOptimizes, and lets integer overflow wrap instead of panicking
    --show <stages>Prints what the compiler made at each stage: tokens, ast, types, mir, llvm, or all
    --offlineUses only the registry packages in the cache
    --color <when>Colors the output: auto, always, or never

    --release checks the code a release build compiles, which matters where #If tests it.

    Examples

    fb check                 # the package the current folder is in
fb check tools/report.fb # a file outside a package

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