dummy enum generation code assumes that values are given in ascending order

[twiglet]

see Generic below:

public enum CorCallingConvention
{
Default = 0x0,

    VarArg        = 0x5,
    Field         = 0x6,
    LocalSig     = 0x7,
    Property      = 0x8,
    Unmanaged         = 0x9,
    GenericInst   = 0xa,  // generic method instantiation
    NativeVarArg  = 0xb,  // used ONLY for 64bit vararg PInvoke calls

        // The high bits of the calling convention convey additional info
    Mask      = 0x0f,  // Calling convention is bottom 4 bits
    HasThis   = 0x20,  // Top bit indicates a 'this' parameter
    ExplicitThis = 0x40,  // This parameter is explicitly in the signature
    Generic   = 0x10,  // Generic method sig with explicit number of type arguments (precedes ordinary parameter count)
};