Merge #194 #195

194: Update to arbitrary-1 and quickcheck-1 r=cuviper a=cuviper



195: Change Debug to match Display r=cuviper a=cuviper

The derived `Debug` showed the raw digit data, which is sometimes useful
if you're debugging `num-bigint` itself, but annoying in many other
contexts. For something like a simple `dbg!` call in a program, you
probably just want to see the numeric value.

This is not _necessarily_ a breaking change, but we'll treat it so.

Co-authored-by: Josh Stone <cuviper@gmail.com>

Author: bors[bot]

.github/workflows/ci.yaml

@@ -14,8 +14,10 @@ jobs:
       matrix:
         rust: [
           1.31.0, # 2018!
-          1.34.0, # quickcheck, has_try_from
+          1.34.0, # has_try_from
           1.36.0, # alloc, rand
+          1.40.0, # arbitrary
+          1.46.0, # quickcheck
           stable,
           beta,
           nightly

Cargo.toml

@@ -62,12 +62,12 @@ default-features = false
 
 [dependencies.quickcheck]
 optional = true
-version = "0.9"
+version = "1"
 default-features = false
 
 [dependencies.arbitrary]
 optional = true
-version = "0.4"
+version = "1"
 default-features = false
 
 [build-dependencies]

bors.toml

@@ -2,6 +2,8 @@ status = [
   "Test (1.31.0)",
   "Test (1.34.0)",
   "Test (1.36.0)",
+  "Test (1.40.0)",
+  "Test (1.46.0)",
   "Test (stable)",
   "Test (beta)",
   "Test (nightly)",

ci/big_quickcheck/Cargo.toml

@@ -7,10 +7,10 @@ edition = "2018"
 [dependencies]
 num-integer = "0.1.42"
 num-traits = "0.2.11"
-quickcheck_macros = "0.9"
+quickcheck_macros = "1"
 
 [dependencies.quickcheck]
-version = "0.9"
+version = "1"
 default-features = false
 
 [dependencies.num-bigint]

ci/big_quickcheck/src/lib.rs

@@ -9,7 +9,7 @@
 use num_bigint::{BigInt, BigUint};
 use num_integer::Integer;
 use num_traits::{Num, One, Signed, Zero};
-use quickcheck::{QuickCheck, StdThreadGen, TestResult};
+use quickcheck::{Gen, QuickCheck, TestResult};
 use quickcheck_macros::quickcheck;
 
 #[quickcheck]
@@ -42,8 +42,8 @@ fn quickcheck_signed_eq_symmetric(a: BigInt, b: BigInt) -> bool {
 
 #[test]
 fn quickcheck_arith_primitive() {
-    let gen = StdThreadGen::new(usize::max_value());
-    let mut qc = QuickCheck::with_gen(gen);
+    let gen = Gen::new(usize::max_value());
+    let mut qc = QuickCheck::new().gen(gen);
 
     fn test_unsigned_add_primitive(a: usize, b: usize) -> TestResult {
         let actual = BigUint::from(a) + BigUint::from(b);
@@ -79,11 +79,11 @@ fn quickcheck_arith_primitive() {
         }
     }
 
-    fn test_signed_sub_primitive(a: i128, b: i128) -> bool {
-        if b < a {
-            BigInt::from(a - b) == BigInt::from(a) - BigInt::from(b)
-        } else {
-            BigInt::from(b - a) == BigInt::from(b) - BigInt::from(a)
+    fn test_signed_sub_primitive(a: i128, b: i128) -> TestResult {
+        let actual = BigInt::from(a) - BigInt::from(b);
+        match a.checked_sub(b) {
+            None => TestResult::discard(),
+            Some(expected) => TestResult::from_bool(BigInt::from(expected) == actual),
         }
     }
 
@@ -96,7 +96,7 @@ fn quickcheck_arith_primitive() {
     }
 
     fn test_signed_div_primitive(a: i128, b: i128) -> TestResult {
-        if b == 0 {
+        if b == 0 || (a == i128::MIN && b == -1) {
             TestResult::discard()
         } else {
             TestResult::from_bool(BigInt::from(a / b) == BigInt::from(a) / BigInt::from(b))
@@ -108,7 +108,7 @@ fn quickcheck_arith_primitive() {
     qc.quickcheck(test_unsigned_mul_primitive as fn(u64, u64) -> bool);
     qc.quickcheck(test_signed_mul_primitive as fn(i64, i64) -> bool);
     qc.quickcheck(test_unsigned_sub_primitive as fn(u128, u128) -> bool);
-    qc.quickcheck(test_signed_sub_primitive as fn(i128, i128) -> bool);
+    qc.quickcheck(test_signed_sub_primitive as fn(i128, i128) -> TestResult);
     qc.quickcheck(test_unsigned_div_primitive as fn(u128, u128) -> TestResult);
     qc.quickcheck(test_signed_div_primitive as fn(i128, i128) -> TestResult);
 }
@@ -280,8 +280,8 @@ fn quickcheck_signed_conversion(a: BigInt, radix: u8) -> TestResult {
 
 #[test]
 fn quicktest_shift() {
-    let gen = StdThreadGen::new(usize::max_value());
-    let mut qc = QuickCheck::with_gen(gen);
+    let gen = Gen::new(usize::max_value());
+    let mut qc = QuickCheck::new().gen(gen);
 
     fn test_shr_unsigned(a: u64, shift: u8) -> TestResult {
         let shift = (shift % 64) as usize; //shift at most 64 bits
@@ -317,8 +317,8 @@ fn quicktest_shift() {
 
 #[test]
 fn quickcheck_modpow() {
-    let gen = StdThreadGen::new(usize::max_value());
-    let mut qc = QuickCheck::with_gen(gen);
+    let gen = Gen::new(usize::max_value());
+    let mut qc = QuickCheck::new().gen(gen);
 
     fn simple_modpow(base: &BigInt, exponent: &BigInt, modulus: &BigInt) -> BigInt {
         assert!(!exponent.is_negative());

ci/rustup.sh

@@ -5,6 +5,6 @@
 set -ex
 
 ci=$(dirname $0)
-for version in 1.31.0 1.34.0 1.36.0 stable beta nightly; do
+for version in 1.31.0 1.34.0 1.36.0 1.40.0 1.46.0 stable beta nightly; do
     rustup run "$version" "$ci/test_full.sh"
 done

ci/test_full.sh

@@ -28,10 +28,10 @@ if ! check_version $MSRV ; then
 fi
 
 STD_FEATURES=(serde)
-check_version 1.34 && STD_FEATURES+=(quickcheck)
 check_version 1.36 && STD_FEATURES+=(rand)
 check_version 1.36 && NO_STD_FEATURES=(serde rand)
 check_version 1.40 && STD_FEATURES+=(arbitrary)
+check_version 1.46 && STD_FEATURES+=(quickcheck)
 echo "Testing supported features: ${STD_FEATURES[*]}"
 if [ -n "${NO_STD_FEATURES[*]}" ]; then
   echo " no_std supported features: ${NO_STD_FEATURES[*]}"

src/bigint.rs

@@ -59,7 +59,6 @@ impl Neg for Sign {
 }
 
 /// A big signed integer type.
-#[derive(Debug)]
 pub struct BigInt {
     sign: Sign,
     data: BigUint,
@@ -137,6 +136,12 @@ impl Default for BigInt {
     }
 }
 
+impl fmt::Debug for BigInt {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(self, f)
+    }
+}
+
 impl fmt::Display for BigInt {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.pad_integral(!self.is_negative(), "", &self.data.to_str_radix(10))

src/bigint/arbitrary.rs

@@ -1,11 +1,12 @@
 use super::{BigInt, Sign};
 
+#[cfg(feature = "quickcheck")]
 use crate::std_alloc::Box;
 use crate::BigUint;
 
 #[cfg(feature = "quickcheck")]
 impl quickcheck::Arbitrary for BigInt {
-    fn arbitrary<G: quickcheck::Gen>(g: &mut G) -> Self {
+    fn arbitrary(g: &mut quickcheck::Gen) -> Self {
         let positive = bool::arbitrary(g);
         let sign = if positive { Sign::Plus } else { Sign::Minus };
         Self::from_biguint(sign, BigUint::arbitrary(g))
@@ -19,16 +20,20 @@ impl quickcheck::Arbitrary for BigInt {
 }
 
 #[cfg(feature = "arbitrary")]
-impl arbitrary::Arbitrary for BigInt {
+impl arbitrary::Arbitrary<'_> for BigInt {
     fn arbitrary(u: &mut arbitrary::Unstructured<'_>) -> arbitrary::Result<Self> {
         let positive = bool::arbitrary(u)?;
         let sign = if positive { Sign::Plus } else { Sign::Minus };
         Ok(Self::from_biguint(sign, BigUint::arbitrary(u)?))
     }
 
-    fn shrink(&self) -> Box<dyn Iterator<Item = Self>> {
-        let sign = self.sign();
-        let unsigned_shrink = self.data.shrink();
-        Box::new(unsigned_shrink.map(move |x| BigInt::from_biguint(sign, x)))
+    fn arbitrary_take_rest(mut u: arbitrary::Unstructured<'_>) -> arbitrary::Result<Self> {
+        let positive = bool::arbitrary(&mut u)?;
+        let sign = if positive { Sign::Plus } else { Sign::Minus };
+        Ok(Self::from_biguint(sign, BigUint::arbitrary_take_rest(u)?))
+    }
+
+    fn size_hint(depth: usize) -> (usize, Option<usize>) {
+        arbitrary::size_hint::and(bool::size_hint(depth), BigUint::size_hint(depth))
     }
 }

src/biguint.rs

@@ -35,7 +35,6 @@ pub(crate) use self::convert::to_str_radix_reversed;
 pub use self::iter::{U32Digits, U64Digits};
 
 /// A big unsigned integer type.
-#[derive(Debug)]
 pub struct BigUint {
     data: Vec<BigDigit>,
 }
@@ -106,6 +105,12 @@ impl Default for BigUint {
     }
 }
 
+impl fmt::Debug for BigUint {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(self, f)
+    }
+}
+
 impl fmt::Display for BigUint {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.pad_integral(true, "", &self.to_str_radix(10))