[FS-1080] Add new syntax option for Float32.

src/fsharp/LanguageFeatures.fs

@@ -24,6 +24,7 @@ type LanguageFeature =
     | NameOf
     | ImplicitYield
     | OpenStaticClasses
+    | DotlessFloat32Literal
     | PackageManagement
     | FromEndSlicing
     | FixedIndexSlice3d4d
@@ -54,6 +55,7 @@ type LanguageVersion (specifiedVersionAsString) =
             // F# preview
             LanguageFeature.NameOf, previewVersion
             LanguageFeature.OpenStaticClasses, previewVersion
+            LanguageFeature.DotlessFloat32Literal, languageVersion50
             LanguageFeature.PackageManagement, previewVersion
             LanguageFeature.FixedIndexSlice3d4d, previewVersion
             LanguageFeature.FromEndSlicing, previewVersion

src/fsharp/LanguageFeatures.fsi

@@ -12,6 +12,7 @@ type LanguageFeature =
     | NameOf
     | ImplicitYield
     | OpenStaticClasses
+    | DotlessFloat32Literal
     | PackageManagement
     | FromEndSlicing
     | FixedIndexSlice3d4d

src/fsharp/lex.fsl

@@ -193,8 +193,8 @@ let floate = digit ((digit | separator)* digit)? ('.' (digit ((digit | separator
 let float = floatp | floate 
 let bignum =  integer ('I'  | 'N' | 'Z' | 'Q' | 'R' | 'G')
 let ieee64 = float
-let ieee32 = float ('f' | 'F') 
-let decimal = (float | integer) ('m' | 'M') 
+let ieee32 = (float | integer) ('f' | 'F')
+let decimal = (float | integer) ('m' | 'M')
 let xieee32 = xinteger 'l' 'f'
 let xieee64 = xinteger 'L' 'F'
 let escape_char = ('\\' ( '\\' | "\"" | '\'' | 'a' | 'f' | 'v' | 'n' | 't' | 'b' | 'r'))
@@ -335,8 +335,16 @@ rule token args skip = parse
            UNATIVEINT(uint64 (removeUnderscores (lexemeTrimRight lexbuf 2)))
        with _ ->  fail args lexbuf (FSComp.SR.lexOutsideNativeUnsigned())  (UNATIVEINT(0UL)) }
 
- | ieee32     
-     { IEEE32 (try float32(removeUnderscores (lexemeTrimRight lexbuf 1)) with _ -> fail args lexbuf (FSComp.SR.lexInvalidFloat()) 0.0f) }
+ | ieee32
+     { let s = lexemeTrimRight lexbuf 1
+       if lexbuf.SupportsFeature LanguageFeature.DotlessFloat32Literal || s.Contains "." then
+          try
+             IEEE32 (float32 (removeUnderscores s))
+          with _ -> fail args lexbuf (FSComp.SR.lexInvalidFloat()) (IEEE32 0.0f)
+       else
+          fail args lexbuf (FSComp.SR.lexInvalidFloat()) (IEEE32 0.0f)
+     }
+
  | ieee64     
      { IEEE64 (try float(lexeme lexbuf) with _ -> fail args lexbuf (FSComp.SR.lexInvalidFloat()) 0.0) }
 

tests/FSharp.Core.UnitTests/FSharp.Core.UnitTests.fsproj

@@ -26,8 +26,8 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <DefineConstants  Condition="'$(UnitTestType)' == 'xunit'">$(DefineConstants);XUNIT</DefineConstants>
-    <DefineConstants  Condition="'$(UnitTestType)' != 'xunit'">$(DefineConstants);NUNIT</DefineConstants>
+    <DefineConstants Condition="'$(UnitTestType)' == 'xunit'">$(DefineConstants);XUNIT</DefineConstants>
+    <DefineConstants Condition="'$(UnitTestType)' != 'xunit'">$(DefineConstants);NUNIT</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup>
@@ -88,7 +88,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Content Include="**/*"  Exclude="**/*.bak;Directory.Build.Props;Directory.Build.targets" CopyToOutputDirectory="never" />
+    <Content Include="**/*" Exclude="**/*.bak;Directory.Build.Props;Directory.Build.targets;FSharp.Core.UnitTests.fsproj" CopyToOutputDirectory="never" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(BUILD_IN_FSHARP_REPOSITORY)' == 'true'">
@@ -102,8 +102,8 @@
  </ItemGroup>
 
   <ItemGroup Condition="'$(UnitTestType)' == 'xunit'">
-    <PackageReference Include="xunit" Version="2.4.1"  PrivateAssets="All" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1"  PrivateAssets="All" />
+    <PackageReference Include="xunit" Version="2.4.1" PrivateAssets="All" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" PrivateAssets="All" />
   </ItemGroup>
 
 </Project>

tests/fsharp/Compiler/CompilerAssert.fs

@@ -232,19 +232,22 @@ let main argv = 0"""
     let TypeCheckSingleError (source: string) (expectedServerity: FSharpErrorSeverity) (expectedErrorNumber: int) (expectedErrorRange: int * int * int * int) (expectedErrorMsg: string) =
         TypeCheckWithErrors source [| expectedServerity, expectedErrorNumber, expectedErrorRange, expectedErrorMsg |]
 
-    let CompileExe (source: string) =
-        compile true [||] source (fun (errors, _) ->
+    let CompileExeWithOptions options (source: string) =
+        compile true options source (fun (errors, _) ->
             if errors.Length > 0 then
                 Assert.Fail (sprintf "Compile had warnings and/or errors: %A" errors))
 
+    let CompileExe (source: string) =
+        CompileExeWithOptions [||] source
+
     let CompileExeAndRunWithOptions options (source: string) =
-      compile true options source (fun (errors, outputExe) ->
+        compile true options source (fun (errors, outputExe) ->
 
-          if errors.Length > 0 then
-              Assert.Fail (sprintf "Compile had warnings and/or errors: %A" errors)
+            if errors.Length > 0 then
+                Assert.Fail (sprintf "Compile had warnings and/or errors: %A" errors)
 
-          executeBuiltApp outputExe
-      )
+            executeBuiltApp outputExe
+        )
 
     let CompileExeAndRun (source: string) =
         CompileExeAndRunWithOptions [||] source

tests/fsharp/Compiler/Conformance/BasicGrammarElements/BasicConstants.fs

@@ -9,7 +9,7 @@ open FSharp.Compiler.SourceCodeServices
 module ``Basic Grammar Element Constants`` =
 
     [<Test>]
-    let `` Basic constants compile `` () =
+    let ``Basic constants compile `` () =
         CompilerAssert.Pass 
             """
 let sbyteConst = 1y
@@ -25,6 +25,8 @@ let uint64Const = 1uL
 let ieee32Const1 = 1.0f
 let ieee32Const2 = 1.0F
 let ieee32Const3 = 0x0000000000000001lf
+let ieee32Const4 = 1F
+let ieee32Const5 = 1f
 
 let ieee64Const1 = 1.0
 let ieee64Const2 = 0x0000000000000001LF
@@ -172,3 +174,25 @@ let x14 = 0o5_2
 if x14 <> 0o52 then failwith "Wrong parsing"
 printfn "%A" x14
             """
+    [<Test>]
+    let ``float without dot``() = 
+        CompilerAssert.CompileExeWithOptions [|"--langversion:preview"|]
+            """
+let x = 42f
+printfn "%A" x
+            """
+
+    [<Test>]
+    let ``float with dot``() = 
+        CompilerAssert.CompileExeWithOptions [|"--langversion:preview"|]
+            """
+let x = 42.f
+printfn "%A" x
+            """
+
+    [<Test>]
+    let ``floats with dot should be equal to floats without dot``() = 
+        CompilerAssert.CompileExeAndRunWithOptions [|"--langversion:preview"|]
+            """
+if 1.0f <> 1f then failwith "1.0f is not equal to 1f" 
+            """

tests/fsharpqa/Source/Conformance/BasicGrammarElements/Constants/E_UnderscoreLiterals.fs

@@ -1,19 +1,17 @@
-//<Expects id="FS1156" span="(18,11-18,13)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(18,14-18,19)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS0599" span="(18,13-18,14)" status="error">Missing qualification after '.'</Expects>
-//<Expects id="FS1156" span="(19,11-19,19)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(20,29-20,42)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(22,10-22,13)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(16,11-16,13)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(17,11-17,19)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(18,29-18,42)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(20,10-20,13)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(21,10-21,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(22,10-22,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
 //<Expects id="FS1156" span="(23,10-23,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(24,10-24,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(24,10-24,14)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
 //<Expects id="FS1156" span="(25,10-25,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(26,10-26,14)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(26,10-26,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
 //<Expects id="FS1156" span="(27,10-27,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(28,10-28,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(29,10-29,15)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(30,11-30,18)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(31,11-31,18)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
-//<Expects id="FS1156" span="(32,11-32,16)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(28,11-28,18)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(29,11-29,18)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
+//<Expects id="FS1156" span="(30,11-30,16)" status="error">This is not a valid numeric literal. Valid numeric literals include</Expects>
 
 let pi1 = 3_.1415F
 let pi2 = 3._1415F