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[release/dev17.12] Respect generic arity in method uniqueness #17805

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merged 1 commit into from
Sep 27, 2024
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[release/dev17.12] Respect generic arity in method uniqueness #17805

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1 change: 1 addition & 0 deletions src/Compiler/AbstractIL/il.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -5690,6 +5690,7 @@ let resolveILMethodRefWithRescope r (td: ILTypeDef) (mref: ILMethodRef) =
mref.CallingConv = md.CallingConv
&& (md.Parameters, argTypes)
||> List.lengthsEqAndForall2 (fun p1 p2 -> r p1.Type = p2)
&& md.GenericParams.Length = mref.GenericArity
&&
// REVIEW: this uses equality on ILType. For CMOD_OPTIONAL this is not going to be correct
r md.Return.Type = retType)
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14 changes: 14 additions & 0 deletions tests/FSharp.Compiler.Private.Scripting.UnitTests/FSharpScriptTests.fs
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Expand Up @@ -486,3 +486,17 @@ test pfloat "1.234"
let opt = script.Eval(code) |> getValue
let value = opt.Value
Assert.True(true = downcast value.ReflectionValue)

[<Fact>]
member _.``Nuget package with method duplicates differing only in generic arity``() =
// regression test for: https://github.com/dotnet/fsharp/issues/17796
// Was an internal error
let code = """
#r "nuget: Microsoft.Extensions.DependencyInjection.Abstractions"
open Microsoft.Extensions.DependencyInjection
let add (col:IServiceCollection) =
col.AddSingleton<string,string>()
"""
use script = new FSharpScript(additionalArgs=[| |])
let _value,diag = script.Eval(code)
Assert.Empty(diag)