Let TransparentCompiler respect hash directives like #nowarn (dotnet#16667)

Author: dawedawe

src/Compiler/Service/TransparentCompiler.fs

@@ -1198,29 +1198,16 @@ type internal TransparentCompiler
                         tcConfig.flatErrors
                     )
 
-                use _ =
-                    new CompilationGlobalsScope(errHandler.DiagnosticsLogger, BuildPhase.TypeCheck)
-
                 // Apply nowarns to tcConfig (may generate errors, so ensure diagnosticsLogger is installed)
                 let tcConfig =
                     ApplyNoWarnsToTcConfig(tcConfig, parsedMainInput, Path.GetDirectoryName mainInputFileName)
 
-                // update the error handler with the modified tcConfig
-                errHandler.DiagnosticOptions <- tcConfig.diagnosticsOptions
-
                 let diagnosticsLogger = errHandler.DiagnosticsLogger
 
-                //let capturingDiagnosticsLogger = CapturingDiagnosticsLogger("TypeCheck")
-
-                //let diagnosticsLogger =
-                //    GetDiagnosticsLoggerFilteringByScopedPragmas(
-                //        false,
-                //        input.ScopedPragmas,
-                //        tcConfig.diagnosticsOptions,
-                //        capturingDiagnosticsLogger
-                //    )
+                let diagnosticsLogger =
+                    GetDiagnosticsLoggerFilteringByScopedPragmas(false, input.ScopedPragmas, tcConfig.diagnosticsOptions, diagnosticsLogger)
 
-                //use _ = new CompilationGlobalsScope(diagnosticsLogger, BuildPhase.TypeCheck)
+                use _ = new CompilationGlobalsScope(diagnosticsLogger, BuildPhase.TypeCheck)
 
                 //beforeFileChecked.Trigger fileName
 

tests/FSharp.Compiler.ComponentTests/ConstraintSolver/ObjInference.fs

@@ -34,13 +34,14 @@ let x = deserialize "" |> f""", 3, 9, 3, 28
     [<Theory>]
     [<MemberData(nameof(warningCases))>]
     let ``Warning is emitted when type Obj is inferred``(code: string, line1: int, col1: int, line2: int, col2: int) =
+        let code = $"module M\n{code}"
         FSharp code
         |> withErrorRanges
         |> withWarnOn 3559
         |> withLangVersion80
-        |> typecheck
+        |> compile
         |> shouldFail
-        |> withSingleDiagnostic (Information 3559, Line line1, Col col1, Line line2, Col col2, message)
+        |> withSingleDiagnostic (Warning 3559, Line (line1 + 1), Col col1, Line (line2 + 1), Col col2, message)
 
     let quotableNoWarningCases =
         [
@@ -110,13 +111,13 @@ let f () = x = x |> ignore""" // measure is inferred as 1, but that's not covere
     [<Theory>]
     [<MemberData(nameof(quotableWarningCases))>]
     let ``Warn also inside quotations of acceptable code``(expr: string, line1: int, col1: int, line2: int, col2: int) =
-        sprintf "<@ %s @> |> ignore" expr
+        sprintf "module M\n<@ %s @> |> ignore" expr
         |> FSharp
         |> withWarnOn 3559
         |> withLangVersion80
-        |> typecheck
+        |> compile
         |> shouldFail
-        |> withSingleDiagnostic (Information 3559, Line line1, Col (col1 + 3), Line line2, Col (col2 + 3), message)
+        |> withSingleDiagnostic (Warning 3559, Line (line1 + 1), Col (col1 + 3), Line (line2 + 1), Col (col2 + 3), message)
 
     [<Theory>]
     [<MemberData(nameof(quotableNoWarningCases))>]

tests/service/ExprTests.fs

@@ -3605,3 +3605,27 @@ let ``Test ProjectForWitnesses4 GetWitnessPassingInfo`` useTransparentCompiler =
     printfn "actual:\n\n%A" actual
     actual
       |> shouldPairwiseEqual expected
+
+module internal ProjectForNoWarnHashDirective =
+
+    let fileSource1 = """
+module N.M
+#nowarn "40"
+let rec f = new System.EventHandler(fun _ _ -> f.Invoke(null,null))
+"""
+    
+    let createOptions() = createOptionsAux [fileSource1] []
+    
+[<TestCase(false)>]
+[<TestCase(true)>]
+[<Test>]
+let ``Test NoWarn HashDirective`` useTransparentCompiler =
+    let cleanup, options = ProjectForNoWarnHashDirective.createOptions()
+    use _holder = cleanup
+    let exprChecker = FSharpChecker.Create(keepAssemblyContents=true, useTransparentCompiler=useTransparentCompiler)
+    let wholeProjectResults = exprChecker.ParseAndCheckProject(options) |> Async.RunImmediate
+
+    for e in wholeProjectResults.Diagnostics do
+        printfn "ProjectForNoWarnHashDirective error: <<<%s>>>" e.Message
+
+    wholeProjectResults.Diagnostics.Length |> shouldEqual 0