[embedded] Drop several #ifs and fatalError()s by adding an unavailable ExpressibleByStringInterpolation String conformance

Author: kubamracek

stdlib/public/core/Availability.swift

@@ -109,14 +109,10 @@ extension _SwiftStdlibVersion {
 extension _SwiftStdlibVersion: CustomStringConvertible {
   @available(SwiftStdlib 5.7, *)
   public var description: String {
-    #if $Embedded
-    fatalError()
-    #else
     let major = _value >> 16
     let minor = (_value >> 8) & 0xFF
     let patch = _value & 0xFF
     return "\(major).\(minor).\(patch)"
-    #endif
   }
 }
 

stdlib/public/core/CTypes.swift

@@ -268,15 +268,11 @@ public struct CVaListPointer {
 @_unavailableInEmbedded
 extension CVaListPointer: CustomDebugStringConvertible {
   public var debugDescription: String {
-    #if !$Embedded
     return "(\(_value.__stack.debugDescription), " +
            "\(_value.__gr_top.debugDescription), " +
            "\(_value.__vr_top.debugDescription), " +
            "\(_value.__gr_off), " +
            "\(_value.__vr_off))"
-    #else
-    fatalError()
-    #endif
   }
 }
 

stdlib/public/core/ClosedRange.swift

@@ -385,24 +385,16 @@ extension ClosedRange: CustomStringConvertible {
   /// A textual representation of the range.
   @inlinable // trivial-implementation...
   public var description: String {
-    #if $Embedded
-    fatalError()
-    #else
     return "\(lowerBound)...\(upperBound)"
-    #endif
   }
 }
 
 @_unavailableInEmbedded
 extension ClosedRange: CustomDebugStringConvertible {
   /// A textual representation of the range, suitable for debugging.
   public var debugDescription: String {
-    #if $Embedded
-    fatalError()
-    #else
     return "ClosedRange(\(String(reflecting: lowerBound))"
     + "...\(String(reflecting: upperBound)))"
-    #endif
   }
 }
 
@@ -490,9 +482,6 @@ public typealias CountableClosedRange<Bound: Strideable> = ClosedRange<Bound>
 @_unavailableInEmbedded
 extension ClosedRange: Decodable where Bound: Decodable {
   public init(from decoder: Decoder) throws {
-    #if $Embedded
-    fatalError()
-    #else
     var container = try decoder.unkeyedContainer()
     let lowerBound = try container.decode(Bound.self)
     let upperBound = try container.decode(Bound.self)
@@ -503,7 +492,6 @@ extension ClosedRange: Decodable where Bound: Decodable {
           debugDescription: "Cannot initialize \(ClosedRange.self) with a lowerBound (\(lowerBound)) greater than upperBound (\(upperBound))"))
     }
     self.init(_uncheckedBounds: (lower: lowerBound, upper: upperBound))
-    #endif
   }
 }
 

stdlib/public/core/CollectionOfOne.swift

@@ -162,11 +162,7 @@ extension CollectionOfOne: RandomAccessCollection, MutableCollection {
 extension CollectionOfOne: CustomDebugStringConvertible {
   /// A textual representation of the collection, suitable for debugging.
   public var debugDescription: String {
-    #if !$Embedded
     return "CollectionOfOne(\(String(reflecting: _element)))"
-    #else
-    fatalError()
-    #endif
   }
 }
 

stdlib/public/core/EmbeddedStubs.swift

@@ -103,6 +103,9 @@ extension String {
   public init(stringInterpolation: DefaultStringInterpolation) { fatalError() }
 }
 
+@_unavailableInEmbedded
+extension String: ExpressibleByStringInterpolation { }
+
 @_unavailableInEmbedded
 public protocol LosslessStringConvertible: CustomStringConvertible {
   init?(_ description: String)

stdlib/public/core/Integers.swift

@@ -3046,7 +3046,14 @@ extension FixedWidthInteger {
   @inline(__always)
   public init<T: BinaryFloatingPoint>(_ source: T) {
     guard let value = Self._convert(from: source).value else {
-      fatalError()
+      #if !$Embedded
+      fatalError("""
+        \(T.self) value cannot be converted to \(Self.self) because it is \
+        outside the representable range
+        """)
+      #else
+      fatalError("value not representable")
+      #endif
     }
     self = value
   }

stdlib/public/core/ObjectIdentifier.swift

@@ -68,11 +68,7 @@ public struct ObjectIdentifier: Sendable {
 extension ObjectIdentifier: CustomDebugStringConvertible {
   /// A textual representation of the identifier, suitable for debugging.
   public var debugDescription: String {
-    #if !$Embedded
     return "ObjectIdentifier(\(_rawPointerToString(_value)))"
-    #else
-    fatalError()
-    #endif
   }
 }
 

stdlib/public/core/Range.swift

@@ -380,24 +380,16 @@ extension Range: CustomStringConvertible {
   /// A textual representation of the range.
   @inlinable // trivial-implementation
   public var description: String {
-    #if $Embedded
-    fatalError()
-    #else
     return "\(lowerBound)..<\(upperBound)"
-    #endif
   }
 }
 
 @_unavailableInEmbedded
 extension Range: CustomDebugStringConvertible {
   /// A textual representation of the range, suitable for debugging.
   public var debugDescription: String {
-    #if !$Embedded
     return "Range(\(String(reflecting: lowerBound))"
     + "..<\(String(reflecting: upperBound)))"
-    #else
-    fatalError()
-    #endif
   }
 }
 
@@ -451,7 +443,6 @@ extension Range: Hashable where Bound: Hashable {
 @_unavailableInEmbedded
 extension Range: Decodable where Bound: Decodable {
   public init(from decoder: Decoder) throws {
-    #if !$Embedded
     var container = try decoder.unkeyedContainer()
     let lowerBound = try container.decode(Bound.self)
     let upperBound = try container.decode(Bound.self)
@@ -462,9 +453,6 @@ extension Range: Decodable where Bound: Decodable {
           debugDescription: "Cannot initialize \(Range.self) with a lowerBound (\(lowerBound)) greater than upperBound (\(upperBound))"))
     }
     self.init(_uncheckedBounds: (lower: lowerBound, upper: upperBound))
-    #else
-    fatalError()
-    #endif
   }
 }
 

stdlib/public/core/UnsafeBufferPointer.swift.gyb

@@ -1194,12 +1194,8 @@ extension Unsafe${Mutable}BufferPointer {
 extension Unsafe${Mutable}BufferPointer: CustomDebugStringConvertible {
   /// A textual representation of the buffer, suitable for debugging.
   public var debugDescription: String {
-  #if $Embedded
-  fatalError()
-  #else
     return "Unsafe${Mutable}BufferPointer"
       + "(start: \(_position.map(String.init(describing:)) ?? "nil"), count: \(count))"
-  #endif
   }
 }
 %end

stdlib/public/core/UnsafeRawBufferPointer.swift.gyb

@@ -1147,12 +1147,8 @@ extension Unsafe${Mutable}RawBufferPointer {
 extension Unsafe${Mutable}RawBufferPointer: CustomDebugStringConvertible {
   /// A textual representation of the buffer, suitable for debugging.
   public var debugDescription: String {
-  #if $Embedded
-  fatalError()
-  #else
     return "${Self}"
       + "(start: \(_position.map(String.init(describing:)) ?? "nil"), count: \(count))"
-  #endif
   }
 }