remove unused 'frunk' feature and add From's for SizeRange and Probab…

…ility

proptest/src/collection.rs

@@ -165,18 +165,9 @@ impl From<RangeToInclusive<usize>> for SizeRange {
     }
 }
 
-#[cfg(feature = "frunk")]
-impl Generic for SizeRange {
-    type Repr = RangeInclusive<usize>;
-
-    /// Converts the `SizeRange` into `Range<usize>`.
-    fn into(self) -> Self::Repr {
-        self.0
-    }
-
-    /// Converts `RangeInclusive<usize>` into `SizeRange`.
-    fn from(r: Self::Repr) -> Self {
-        r.into()
+impl From<SizeRange> for Range<usize> {
+    fn from(size_range: SizeRange) -> Self {
+        size_range.0
     }
 }
 

proptest/src/lib.rs

@@ -42,15 +42,6 @@ extern crate std;
 #[macro_use]
 extern crate alloc;
 
-#[cfg(feature = "frunk")]
-#[macro_use]
-extern crate frunk_core;
-
-#[cfg(feature = "frunk")]
-#[macro_use]
-mod product_frunk;
-
-#[cfg(not(feature = "frunk"))]
 #[macro_use]
 mod product_tuple;
 

proptest/src/option.rs

@@ -40,17 +40,6 @@ impl Default for Probability {
     }
 }
 
-impl From<f64> for Probability {
-    /// Creates a `Probability` from a `f64`.
-    ///
-    /// # Panics
-    ///
-    /// Panics if the probability is outside interval `[0.0, 1.0]`.
-    fn from(prob: f64) -> Self {
-        Probability::new(prob)
-    }
-}
-
 impl Probability {
     /// Creates a `Probability` from a `f64`.
     ///
@@ -81,25 +70,14 @@ impl Probability {
     }
 }
 
-#[cfg(feature = "frunk")]
-use frunk_core::generic::Generic;
-
-#[cfg(feature = "frunk")]
-impl Generic for Probability {
-    type Repr = f64;
-
-    /// Converts the `Probability` into an `f64`.
-    fn into(self) -> Self::Repr {
-        self.0
-    }
-
+impl From<f64> for Probability {
     /// Creates a `Probability` from a `f64`.
     ///
     /// # Panics
     ///
     /// Panics if the probability is outside interval `[0.0, 1.0]`.
-    fn from(r: Self::Repr) -> Self {
-        r.into()
+    fn from(prob: f64) -> Self {
+        Probability::new(prob)
     }
 }
 

proptest/src/product_tuple.rs

@@ -8,9 +8,7 @@
 // except according to those terms.
 
 //! Defines macros for product type creation, extraction, and the type signature
-//! itself. This version uses tuples. This mechanism is used to be very
-//! loosely coupled with `frunk_core` so that only `lib.rs` has to be changed
-//! in the event that Rust gets tuple-variadic generics.
+//! itself. This version uses tuples. 
 
 macro_rules! product_type {
     ($factor: ty) => {