From @dustinmoris on December 16, 2017 22:27

Steps to reproduce

dotnet new giraffe

or as @cartermp demo'd in his blog post:

dotnet new giraffe -o GiraffeSample

Expected behavior

The CLI should identify that the giraffe template only supports F# as language and therefore successfully create an F# Giraffe application without asking the user to specify the additional -lang parameter.

Actual behavior

The command fails and shows help for dotnet new. This is a regression bug as it worked as expected in previous versions.

Environment data

dotnet --info output:

.NET Command Line Tools (2.0.3)

Product Information:
 Version:            2.0.3
 Commit SHA-1 hash:  eb1d5ee318

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.13
 OS Platform: Darwin
 RID:         osx.10.12-x64
 Base Path:   /usr/local/share/dotnet/sdk/2.0.3/

Microsoft .NET Core Shared Framework Host

  Version  : 2.0.3
  Build    : a9190d4a75f4a982ae4b4fa8d1a24526566c69df

Copied from original issue: dotnet/cli#8257