I just built fsharp.core.dll with warning level 5 and only got these 16 errors

[KevinRansom]

Does anyone want to see if we can remove these errors so we can up the warning level for fsharp.core builds?

"C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj" (Rebuild target) (1) ->
(CoreCompile target) ->
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\local.fs(151,45): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from a
member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\local.fs(151,61): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from a
member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\local.fs(154,51): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from a
member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\local.fs(154,67): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from a
member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\map.fs(579,47): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from a m
ember and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\map.fs(579,64): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from a m
ember and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\map.fs(579,101): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from a
member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\map.fs(579,118): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from a
member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\reflect.fs(131,35): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from
a member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\reflect.fs(132,35): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from
a member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\reflect.fs(132,78): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from
a member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\reflect.fs(133,35): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from
a member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\reflect.fs(133,78): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from
a member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\reflect.fs(133,104): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct fro
m a member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\printf.fs(1097,82): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from
a member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]
C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\printf.fs(1106,84): error FS0052: The value has been copied to ensure the original is not mutated by this operation or because the copy is implicit when returning a struct from
a member and another member is then accessed [C:\microsoft\visualfsharp\src\fsharp\FSharp.Core\FSharp.Core.fsproj]

0 Warning(s)
16 Error(s)