Repro steps and actual behavior

FSharp.Linq.RuntimeHelpers.LeafExpressionConverter.EvaluateQuotation raises a NotSupportedException when the quotation contains sequencing or variable/property/field mutation:

let eval = LeafExpressionConverter.EvaluateQuotation

eval <@ a; b @>
eval <@ a <- b @>
eval <@ a.b <- c @>
// System.NotSupportedException: Could not convert the following F# Quotation to a LINQ Expression Tree

Also, when the quotation is of type unit and the compiled expression tree is of type System.Void (such as a void method call) or something else (a mutation), Linq raises an ArgumentException:

eval <@ System.Console.WriteLine("Hello, World") @>
// System.ArgumentException: Expression of type 'System.Void' cannot be used for return type 'Microsoft.FSharp.Core.Unit'

Expected behavior

The function should correctly compile the expression to Linq tree and execute in these cases.

Known workarounds

Avoid these problematic constructs in the quotation. For example, write a.set_b(c) instead of a.b <- c.