Auto merge of #55373 - estebank:macro-rep, r=<try>

Warn on incorrect unseparated repetition

Macro pattern `($a:expr $b:expr)` is invalid, for good reason.
Correctly reject pattern `($($a:expr)*)`, as it is functionally the
same.

Fix #44975, fix #48220.

Author: bors

src/liballoc/collections/vec_deque.rs

@@ -2429,7 +2429,7 @@ __impl_slice_eq1! { VecDeque<A>, &'b [B] }
 __impl_slice_eq1! { VecDeque<A>, &'b mut [B] }
 
 macro_rules! array_impls {
-    ($($N: expr)+) => {
+    ($($N: expr),+) => {
         $(
             __impl_slice_eq1! { VecDeque<A>, [B; $N] }
             __impl_slice_eq1! { VecDeque<A>, &'b [B; $N] }
@@ -2439,10 +2439,10 @@ macro_rules! array_impls {
 }
 
 array_impls! {
-     0  1  2  3  4  5  6  7  8  9
-    10 11 12 13 14 15 16 17 18 19
-    20 21 22 23 24 25 26 27 28 29
-    30 31 32
+     0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
+    10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+    20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+    30, 31, 32
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

src/liballoc/vec.rs

@@ -2065,7 +2065,7 @@ __impl_slice_eq1! { Cow<'a, [A]>, &'b mut [B], Clone }
 __impl_slice_eq1! { Cow<'a, [A]>, Vec<B>, Clone }
 
 macro_rules! array_impls {
-    ($($N: expr)+) => {
+    ($($N: expr),+) => {
         $(
             // NOTE: some less important impls are omitted to reduce code bloat
             __impl_slice_eq1! { Vec<A>, [B; $N] }
@@ -2079,10 +2079,10 @@ macro_rules! array_impls {
 }
 
 array_impls! {
-     0  1  2  3  4  5  6  7  8  9
-    10 11 12 13 14 15 16 17 18 19
-    20 21 22 23 24 25 26 27 28 29
-    30 31 32
+     0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
+    10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+    20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+    30, 31, 32
 }
 
 /// Implements comparison of vectors, lexicographically.

src/libcore/array.rs

@@ -116,7 +116,7 @@ macro_rules! __impl_slice_eq2 {
 
 // macro for implementing n-element array functions and operations
 macro_rules! array_impls {
-    ($($N:expr)+) => {
+    ($($N:expr),+) => {
         $(
             #[stable(feature = "rust1", since = "1.0.0")]
             impl<T> AsRef<[T]> for [T; $N] {
@@ -257,10 +257,10 @@ macro_rules! array_impls {
 }
 
 array_impls! {
-     0  1  2  3  4  5  6  7  8  9
-    10 11 12 13 14 15 16 17 18 19
-    20 21 22 23 24 25 26 27 28 29
-    30 31 32
+     0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
+    10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+    20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+    30, 31, 32
 }
 
 // The Default impls cannot be generated using the array_impls! macro because

src/libcore/clone.rs

@@ -158,7 +158,7 @@ mod impls {
     use super::Clone;
 
     macro_rules! impl_clone {
-        ($($t:ty)*) => {
+        ($($t:ty),*) => {
             $(
                 #[stable(feature = "rust1", since = "1.0.0")]
                 impl Clone for $t {
@@ -172,10 +172,10 @@ mod impls {
     }
 
     impl_clone! {
-        usize u8 u16 u32 u64 u128
-        isize i8 i16 i32 i64 i128
-        f32 f64
-        bool char
+        usize, u8, u16, u32, u64, u128,
+        isize, i8, i16, i32, i64, i128,
+        f32, f64,
+        bool, char
     }
 
     #[unstable(feature = "never_type", issue = "35121")]

src/libcore/cmp.rs

@@ -863,7 +863,7 @@ mod impls {
     use cmp::Ordering::{self, Less, Greater, Equal};
 
     macro_rules! partial_eq_impl {
-        ($($t:ty)*) => ($(
+        ($($t:ty),*) => ($(
             #[stable(feature = "rust1", since = "1.0.0")]
             impl PartialEq for $t {
                 #[inline]
@@ -883,20 +883,20 @@ mod impls {
     }
 
     partial_eq_impl! {
-        bool char usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64
+        bool, char, usize, u8, u16, u32, u64, u128, isize, i8, i16, i32, i64, i128, f32, f64
     }
 
     macro_rules! eq_impl {
-        ($($t:ty)*) => ($(
+        ($($t:ty),*) => ($(
             #[stable(feature = "rust1", since = "1.0.0")]
             impl Eq for $t {}
         )*)
     }
 
-    eq_impl! { () bool char usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
+    eq_impl! { (), bool, char, usize, u8, u16, u32, u64, u128, isize, i8, i16, i32, i64, i128 }
 
     macro_rules! partial_ord_impl {
-        ($($t:ty)*) => ($(
+        ($($t:ty),*) => ($(
             #[stable(feature = "rust1", since = "1.0.0")]
             impl PartialOrd for $t {
                 #[inline]
@@ -936,10 +936,10 @@ mod impls {
         }
     }
 
-    partial_ord_impl! { f32 f64 }
+    partial_ord_impl! { f32, f64 }
 
     macro_rules! ord_impl {
-        ($($t:ty)*) => ($(
+        ($($t:ty),*) => ($(
             #[stable(feature = "rust1", since = "1.0.0")]
             impl PartialOrd for $t {
                 #[inline]
@@ -982,7 +982,7 @@ mod impls {
         }
     }
 
-    ord_impl! { char usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
+    ord_impl! { char, usize, u8, u16, u32, u64, u128, isize, i8, i16, i32, i64, i128 }
 
     #[unstable(feature = "never_type", issue = "35121")]
     impl PartialEq for ! {

src/libcore/iter/range.rs

@@ -72,7 +72,7 @@ macro_rules! step_identical_methods {
 }
 
 macro_rules! step_impl_unsigned {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         #[unstable(feature = "step_trait",
                    reason = "likely to be replaced by finer-grained traits",
                    issue = "42168")]
@@ -145,7 +145,7 @@ macro_rules! step_impl_signed {
 }
 
 macro_rules! step_impl_no_between {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         #[unstable(feature = "step_trait",
                    reason = "likely to be replaced by finer-grained traits",
                    issue = "42168")]
@@ -165,7 +165,7 @@ macro_rules! step_impl_no_between {
     )*)
 }
 
-step_impl_unsigned!(usize u8 u16);
+step_impl_unsigned!(usize, u8, u16);
 #[cfg(not(target_pointer_witdth = "16"))]
 step_impl_unsigned!(u32);
 #[cfg(target_pointer_witdth = "16")]
@@ -182,32 +182,32 @@ step_impl_signed!([i64: u64]);
 // If the target pointer width is not 64-bits, we
 // assume here that it is less than 64-bits.
 #[cfg(not(target_pointer_width = "64"))]
-step_impl_no_between!(u64 i64);
-step_impl_no_between!(u128 i128);
+step_impl_no_between!(u64, i64);
+step_impl_no_between!(u128, i128);
 
 macro_rules! range_exact_iter_impl {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         #[stable(feature = "rust1", since = "1.0.0")]
         impl ExactSizeIterator for ops::Range<$t> { }
     )*)
 }
 
 macro_rules! range_incl_exact_iter_impl {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         #[stable(feature = "inclusive_range", since = "1.26.0")]
         impl ExactSizeIterator for ops::RangeInclusive<$t> { }
     )*)
 }
 
 macro_rules! range_trusted_len_impl {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         #[unstable(feature = "trusted_len", issue = "37572")]
         unsafe impl TrustedLen for ops::Range<$t> { }
     )*)
 }
 
 macro_rules! range_incl_trusted_len_impl {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         #[unstable(feature = "trusted_len", issue = "37572")]
         unsafe impl TrustedLen for ops::RangeInclusive<$t> { }
     )*)
@@ -276,15 +276,15 @@ impl<A: Step> Iterator for ops::Range<A> {
 // Range<{u,i}64> and RangeInclusive<{u,i}{32,64,size}> are excluded
 // because they cannot guarantee having a length <= usize::MAX, which is
 // required by ExactSizeIterator.
-range_exact_iter_impl!(usize u8 u16 u32 isize i8 i16 i32);
-range_incl_exact_iter_impl!(u8 u16 i8 i16);
+range_exact_iter_impl!(usize, u8, u16, u32, isize, i8, i16, i32);
+range_incl_exact_iter_impl!(u8, u16, i8, i16);
 
 // These macros generate `TrustedLen` impls.
 //
 // They need to guarantee that .size_hint() is either exact, or that
 // the upper bound is None when it does not fit the type limits.
-range_trusted_len_impl!(usize isize u8 i8 u16 i16 u32 i32 i64 u64);
-range_incl_trusted_len_impl!(usize isize u8 i8 u16 i16 u32 i32 i64 u64);
+range_trusted_len_impl!(usize, isize, u8, i8, u16, i16, u32, i32, i64, u64);
+range_incl_trusted_len_impl!(usize, isize, u8, i8, u16, i16, u32, i32, i64, u64);
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<A: Step> DoubleEndedIterator for ops::Range<A> {

src/libcore/iter/traits.rs

@@ -772,7 +772,7 @@ pub trait Product<A = Self>: Sized {
 
 // NB: explicitly use Add and Mul here to inherit overflow checks
 macro_rules! integer_sum_product {
-    (@impls $zero:expr, $one:expr, #[$attr:meta], $($a:ty)*) => ($(
+    (@impls $zero:expr, $one:expr, #[$attr:meta], $($a:ty),*) => ($(
         #[$attr]
         impl Sum for $a {
             fn sum<I: Iterator<Item=$a>>(iter: I) -> $a {
@@ -801,13 +801,13 @@ macro_rules! integer_sum_product {
             }
         }
     )*);
-    ($($a:ty)*) => (
+    ($($a:ty),*) => (
         integer_sum_product!(@impls 0, 1,
                 #[stable(feature = "iter_arith_traits", since = "1.12.0")],
-                $($a)+);
+                $($a),+);
         integer_sum_product!(@impls Wrapping(0), Wrapping(1),
                 #[stable(feature = "wrapping_iter_arith", since = "1.14.0")],
-                $(Wrapping<$a>)+);
+                $(Wrapping<$a>),+);
     );
 }
 
@@ -843,7 +843,7 @@ macro_rules! float_sum_product {
     )*)
 }
 
-integer_sum_product! { i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usize }
+integer_sum_product! { i8, i16, i32, i64, i128, isize, u8, u16, u32, u64, u128, usize }
 float_sum_product! { f32 f64 }
 
 /// An iterator adapter that produces output as long as the underlying

src/libcore/marker.rs

@@ -665,7 +665,7 @@ mod copy_impls {
     use super::Copy;
 
     macro_rules! impl_copy {
-        ($($t:ty)*) => {
+        ($($t:ty),*) => {
             $(
                 #[stable(feature = "rust1", since = "1.0.0")]
                 impl Copy for $t {}
@@ -674,10 +674,10 @@ mod copy_impls {
     }
 
     impl_copy! {
-        usize u8 u16 u32 u64 u128
-        isize i8 i16 i32 i64 i128
-        f32 f64
-        bool char
+        usize, u8, u16, u32, u64, u128,
+        isize, i8, i16, i32, i64, i128,
+        f32, f64,
+        bool, char
     }
 
     #[unstable(feature = "never_type", issue = "35121")]

src/libcore/num/mod.rs

@@ -4433,7 +4433,7 @@ pub enum FpCategory {
 }
 
 macro_rules! from_str_radix_int_impl {
-    ($($t:ty)*) => {$(
+    ($($t:ty),*) => {$(
         #[stable(feature = "rust1", since = "1.0.0")]
         impl FromStr for $t {
             type Err = ParseIntError;
@@ -4443,7 +4443,7 @@ macro_rules! from_str_radix_int_impl {
         }
     )*}
 }
-from_str_radix_int_impl! { isize i8 i16 i32 i64 i128 usize u8 u16 u32 u64 u128 }
+from_str_radix_int_impl! { isize, i8, i16, i32, i64, i128, usize, u8, u16, u32, u64, u128 }
 
 /// The error type returned when a checked integral type conversion fails.
 #[unstable(feature = "try_from", issue = "33417")]
@@ -4674,7 +4674,7 @@ trait FromStrRadixHelper: PartialOrd + Copy {
 }
 
 macro_rules! doit {
-    ($($t:ty)*) => ($(impl FromStrRadixHelper for $t {
+    ($($t:ty),*) => ($(impl FromStrRadixHelper for $t {
         #[inline]
         fn min_value() -> Self { Self::min_value() }
         #[inline]
@@ -4695,7 +4695,7 @@ macro_rules! doit {
         }
     })*)
 }
-doit! { i8 i16 i32 i64 i128 isize u8 u16 u32 u64 u128 usize }
+doit! { i8, i16, i32, i64, i128, isize, u8, u16, u32, u64, u128, usize }
 
 fn from_str_radix<T: FromStrRadixHelper>(src: &str, radix: u32) -> Result<T, ParseIntError> {
     use self::IntErrorKind::*;

src/libcore/num/wrapping.rs

@@ -128,7 +128,7 @@ sh_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
 
 // FIXME(30524): impl Op<T> for Wrapping<T>, impl OpAssign<T> for Wrapping<T>
 macro_rules! wrapping_impl {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         #[stable(feature = "rust1", since = "1.0.0")]
         impl Add for Wrapping<$t> {
             type Output = Wrapping<$t>;
@@ -323,10 +323,10 @@ macro_rules! wrapping_impl {
     )*)
 }
 
-wrapping_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
+wrapping_impl! { usize, u8, u16, u32, u64, u128, isize, i8, i16, i32, i64, i128 }
 
 macro_rules! wrapping_int_impl {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         impl Wrapping<$t> {
             doc_comment! {
                 concat!("Returns the smallest value that can be represented by this integer type.
@@ -685,10 +685,10 @@ assert_eq!(Wrapping(3i8).pow(6), Wrapping(-39));
     )*)
 }
 
-wrapping_int_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
+wrapping_int_impl! { usize, u8, u16, u32, u64, u128, isize, i8, i16, i32, i64, i128 }
 
 macro_rules! wrapping_int_impl_signed {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         impl Wrapping<$t> {
             doc_comment! {
                 concat!("Returns the number of leading zeros in the binary representation of `self`.
@@ -814,10 +814,10 @@ assert!(!Wrapping(10", stringify!($t), ").is_negative());
     )*)
 }
 
-wrapping_int_impl_signed! { isize i8 i16 i32 i64 i128 }
+wrapping_int_impl_signed! { isize, i8, i16, i32, i64, i128 }
 
 macro_rules! wrapping_int_impl_unsigned {
-    ($($t:ty)*) => ($(
+    ($($t:ty),*) => ($(
         impl Wrapping<$t> {
             doc_comment! {
                 concat!("Returns the number of leading zeros in the binary representation of `self`.
@@ -891,7 +891,7 @@ assert_eq!(Wrapping(200_u8).next_power_of_two(), Wrapping(0));
     )*)
 }
 
-wrapping_int_impl_unsigned! { usize u8 u16 u32 u64 u128 }
+wrapping_int_impl_unsigned! { usize, u8, u16, u32, u64, u128 }
 
 mod shift_max {
     #![allow(non_upper_case_globals)]