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Can't run a .fsx file in interactive mode once a module is defined · Issue #1169...

 3 years ago
source link: https://github.com/dotnet/fsharp/issues/11699
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pkese commented 8 days ago •

edited

Is your feature request related to a problem? Please describe.

Coming from Python world, I create a simple file sum.fsx with a function:

let add x y = x + y

Next I add a validation test that gets executed when I run dotnet fsi sum.fsx:

let add x y = x + y

if fsi.CommandLineArgs = [| __SOURCE_FILE__ |] then
    assert(add 1 2 = 3)
    printfn "my code tested fine"

Next I create another file program.fsx, where sum.fsx gets used:

#load "sum.fsx"
open Sum

printfn $"sum of 10 and 15 is {add 10 15}"

In order to keep things tidy (and compatible with .fsproj type programs), I prepend an explicit module Sum to sum.fsx

module Sum

let add x y = x + y

if fsi.CommandLineArgs = [| __SOURCE_FILE__ |] then
    assert(add 1 2 = 3)
    printfn "my code tested fine"

And my program.fsx runs as expected.

But now testing sum.fsx fails with:

dotnet fsi sum.fsx
/home/peter/test/sum.fsx(4,1): error FS0010: Unexpected start of structured construct in definition. Expected '=' or other token.

I.e. it refuses to run files starting with module.

Describe the solution you'd like

I'd like fsharp not to complain and run the file as expected.

Describe alternatives you've considered

The alternative is to split the sum.fsx into two files where the other file contains just the test part and doesn't start with module.
But it's really annoying.


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