DllImport not detected when using additional attribute

[theimowski]

Issue created from fantomas-ui

When adding MarshalAs attribute to denote marshalling for return value, Fantomas fails to recognise that there's a DllImport above

Code

[<DllImport("userenv.dll", SetLastError = true)>]
[<MarshalAs(UnmanagedType.Bool)>]
extern bool DestroyEnvironmentBlock(IntPtr lpEnvironment)

Result

[<DllImport("userenv.dll", SetLastError = true)>]
[<MarshalAs(UnmanagedType.Bool)>]
let DestroyEnvironmentBlock lpEnvironment: IntPtr: bool = failwith "extern was not given a DllImport attribute"

Options

Fantomas 3.0.0

Name	Value
IndentOnTryWith	false
IndentSpaceNum	4
KeepNewlineAfter	false
PageWidth	120
ReorderOpenDeclaration	false
SemicolonAtEndOfLine	false
SpaceAfterComma	true
SpaceAfterSemicolon	true
SpaceAroundDelimiter	true
SpaceBeforeArgument	true
SpaceBeforeColon	false
StrictMode	false