remove unnecessary try_opt for operations that cannot fail

2 files changed, 6 insertions, 3 deletions

diff --git a/library/core/src/num/int_macros.rs b/library/core/src/num/int_macros.rs
index 199af081560..3665573ab0f 100644
--- a/library/core/src/num/int_macros.rs
+++ b/library/core/src/num/int_macros.rs
@@ -2166,7 +2166,8 @@ macro_rules! int_impl {
 
             let r = try_opt!(self.checked_rem(rhs));
             let m = if (r > 0 && rhs < 0) || (r < 0 && rhs > 0) {
-                try_opt!(r.checked_add(rhs))
+                // r + rhs cannot overflow because they have opposite signs
+                r + rhs
             } else {
                 r
             };
@@ -2174,7 +2175,8 @@ macro_rules! int_impl {
             if m == 0 {
                 Some(self)
             } else {
-                self.checked_add(try_opt!(rhs.checked_sub(m)))
+                // rhs - m cannot overflow because m has the same sign as rhs
+                self.checked_add(rhs - m)
             }
         }
 
diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
index feec448ebbd..baa23e08fe7 100644
--- a/library/core/src/num/uint_macros.rs
+++ b/library/core/src/num/uint_macros.rs
@@ -2119,7 +2119,8 @@ macro_rules! uint_impl {
         pub const fn checked_next_multiple_of(self, rhs: Self) -> Option<Self> {
             match try_opt!(self.checked_rem(rhs)) {
                 0 => Some(self),
-                r => self.checked_add(try_opt!(rhs.checked_sub(r)))
+                // rhs - r cannot overflow because r is smaller than rhs
+                r => self.checked_add(rhs - r)
             }
         }