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should not allow Framework 4 / F# 3.1 combination in project properties.
In a F# project properties, I can select Target Framework .NET 4.0 and at the same time pick F# 3.1 for F# runtime.
It seems this combination is actually not working on machine having only .NET 4 installed, the assembly is compiled with a TargetFrameworkAttribute pointing to .NET 4.5
The project properties dialog should forbid this combination.