@@ -245,8 +245,6 @@ let parseFormatStringInternal
     // there are no accurate intra-string ranges available for exact error message locations within the string.
     // The 'm' range passed as an input is however accurate and covers the whole string.
     //
-    let escapeFormatStringEnabled = g.langVersion.SupportsFeature Features.LanguageFeature.EscapeDotnetFormattableStrings
-
     let fmt, fragments, delimLen =
         match context with
         | Some context when fragRanges.Length > 0 ->
@@ -265,7 +263,7 @@ let parseFormatStringInternal
         | _ ->
             // Don't muck with the fmt when there is no source code context to go get the original
             // source code (i.e. when compiling or background checking)
-            (if escapeFormatStringEnabled then escapeDotnetFormatString fmt else fmt), [ (0, 1, m) ], 1
+            escapeDotnetFormatString fmt, [ (0, 1, m) ], 1
 
     let len = fmt.Length
 
 
@@ -1693,7 +1693,6 @@ reprStateMachineInvalidForm,"The state machine has an unexpected form"
 3548,matchNotAllowedForUnionCaseWithNoData,"Pattern discard is not allowed for union case that takes no data."
 3549,tcSynTypeOrInvalidInDeclaration,"SynType.Or is not permitted in this declaration"
 3550,chkDuplicatedMethodParameter,"Duplicate parameter. The parameter '%s' has been used more that once in this method."
-featureEscapeBracesInFormattableString,"Escapes curly braces before calling FormattableStringFactory.Create when interpolated string literal is typed as FormattableString"
 3551,buildDuplicateFile,"The source file '%s' (at position %d/%d) already appeared in the compilation list (at position %d/%d). Please verify that it is included only once in the project file."
 3552,chkConstructorWithArgumentsOnStaticClasses,"If a type uses both [<Sealed>] and [<AbstractClass>] attributes, it means it is static. Constructor with arguments is not allowed."
 3553,chkAdditionalConstructorOnStaticClasses,"If a type uses both [<Sealed>] and [<AbstractClass>] attributes, it means it is static. Additional constructor is not allowed."
 
@@ -41,7 +41,6 @@ type LanguageFeature =
     | MatchNotAllowedForUnionCaseWithNoData
     | CSharpExtensionAttributeNotRequired
     | ErrorForNonVirtualMembersOverrides
-    | EscapeDotnetFormattableStrings
     | ArithmeticInLiterals
     | ErrorReportingOnStaticClasses
     | WarningWhenCopyAndUpdateRecordChangesAllFields
@@ -162,7 +161,6 @@ type LanguageVersion(versionText, ?disabledFeaturesArray: LanguageFeature array)
                 LanguageFeature.MatchNotAllowedForUnionCaseWithNoData, languageVersion80
                 LanguageFeature.CSharpExtensionAttributeNotRequired, languageVersion80
                 LanguageFeature.ErrorForNonVirtualMembersOverrides, languageVersion80
-                LanguageFeature.EscapeDotnetFormattableStrings, languageVersion80
                 LanguageFeature.ArithmeticInLiterals, languageVersion80
                 LanguageFeature.ErrorReportingOnStaticClasses, languageVersion80
                 LanguageFeature.WarningWhenCopyAndUpdateRecordChangesAllFields, languageVersion80
@@ -347,7 +345,6 @@ type LanguageVersion(versionText, ?disabledFeaturesArray: LanguageFeature array)
         | LanguageFeature.MatchNotAllowedForUnionCaseWithNoData -> FSComp.SR.featureMatchNotAllowedForUnionCaseWithNoData ()
         | LanguageFeature.CSharpExtensionAttributeNotRequired -> FSComp.SR.featureCSharpExtensionAttributeNotRequired ()
         | LanguageFeature.ErrorForNonVirtualMembersOverrides -> FSComp.SR.featureErrorForNonVirtualMembersOverrides ()
-        | LanguageFeature.EscapeDotnetFormattableStrings -> FSComp.SR.featureEscapeBracesInFormattableString ()
         | LanguageFeature.ArithmeticInLiterals -> FSComp.SR.featureArithmeticInLiterals ()
         | LanguageFeature.ErrorReportingOnStaticClasses -> FSComp.SR.featureErrorReportingOnStaticClasses ()
         | LanguageFeature.WarningWhenCopyAndUpdateRecordChangesAllFields ->
 
@@ -31,7 +31,6 @@ type LanguageFeature =
     | MatchNotAllowedForUnionCaseWithNoData
     | CSharpExtensionAttributeNotRequired
     | ErrorForNonVirtualMembersOverrides
-    | EscapeDotnetFormattableStrings
     | ArithmeticInLiterals
     | ErrorReportingOnStaticClasses
     | WarningWhenCopyAndUpdateRecordChangesAllFields