Launching FSI results in an error

[7sharp9]

Logs are as follows:

WARNING: Promise with no error callback:85
winjs.base.js:46Objecterror: Error: pr.catch is not a function
    at Object.onFail (/Users/7sharp9/.vscode/extensions/Ionide.Ionide-fsharp-2.8.10/fable_external/Helpers-729269674.js:73:24)
    at /Users/7sharp9/.vscode/extensions/Ionide.Ionide-fsharp-2.8.10/Components/Fsi.js:97:30
    at /Users/7sharp9/.vscode/extensions/Ionide.Ionide-fsharp-2.8.10/fable_external/Helpers-729269674.js:35:15
    at Object.create (/Users/7sharp9/.vscode/extensions/Ionide.Ionide-fsharp-2.8.10/fable_external/Helpers-729269674.js:32:16)
    at start (/Users/7sharp9/.vscode/extensions/Ionide.Ionide-fsharp-2.8.10/Components/Fsi.js:75:25)
    at /Users/7sharp9/.vscode/extensions/Ionide.Ionide-fsharp-2.8.10/Components/Fsi.js:255:16
    at t.$executeContributedCommand (/Users/7sharp9/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/node/extensionHostProcess.js:10:25694)
    at t.e.handle (/Users/7sharp9/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/node/extensionHostProcess.js:10:10602)
    at s (/Users/7sharp9/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/node/extensionHostProcess.js:7:21356)
    at p (/Users/7sharp9/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/node/extensionHostProcess.js:7:22033)exception: nullhandler: undefinedid: 85parent: undefinedpromise: n.Class.derive._oncancel__proto__: Object
messageService.ts:128pr.catch is not a functione.doShow @ messageService.ts:128
messageService.ts:128Failed to spawn FSI, please ensure it's in PATHe.doShow @ messageService.ts:128

OSX with mono 4.6.1

[7sharp9]

It fails at this point:

Looks like this is the promise and not pr hence the: Error: pr.catch is not a function

[alfonsogarciacaro]

Thanks a lot for the information @7sharp9. I'd have to debug this to see what's going on. Another solution could be to use the Promise helpers in fable-powerpack, which have unit tests and seem to be working fine. I can send a PR to replace them if @Krzysztof-Cieslak wants. fable-powerpack relies on latest fable-compiler alpha to be used as a lib, but we can also just put the code in ionide-helpers.

[Krzysztof-Cieslak]

Should be fixed in 2.9.0