Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 146 insertions, 0 deletions

diff --git a/library/core/src/num/error.rs b/library/core/src/num/error.rs
new file mode 100644
index 000000000..1a223016d
--- /dev/null
+++ b/library/core/src/num/error.rs
@@ -0,0 +1,146 @@
+//! Error types for conversion to integral types.
+
+use crate::convert::Infallible;
+use crate::fmt;
+
+/// The error type returned when a checked integral type conversion fails.
+#[stable(feature = "try_from", since = "1.34.0")]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub struct TryFromIntError(pub(crate) ());
+
+impl TryFromIntError {
+    #[unstable(
+        feature = "int_error_internals",
+        reason = "available through Error trait and this method should \
+                  not be exposed publicly",
+        issue = "none"
+    )]
+    #[doc(hidden)]
+    pub fn __description(&self) -> &str {
+        "out of range integral type conversion attempted"
+    }
+}
+
+#[stable(feature = "try_from", since = "1.34.0")]
+impl fmt::Display for TryFromIntError {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.__description().fmt(fmt)
+    }
+}
+
+#[stable(feature = "try_from", since = "1.34.0")]
+#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
+impl const From<Infallible> for TryFromIntError {
+    fn from(x: Infallible) -> TryFromIntError {
+        match x {}
+    }
+}
+
+#[unstable(feature = "never_type", issue = "35121")]
+impl const From<!> for TryFromIntError {
+    fn from(never: !) -> TryFromIntError {
+        // Match rather than coerce to make sure that code like
+        // `From<Infallible> for TryFromIntError` above will keep working
+        // when `Infallible` becomes an alias to `!`.
+        match never {}
+    }
+}
+
+/// An error which can be returned when parsing an integer.
+///
+/// This error is used as the error type for the `from_str_radix()` functions
+/// on the primitive integer types, such as [`i8::from_str_radix`].
+///
+/// # Potential causes
+///
+/// Among other causes, `ParseIntError` can be thrown because of leading or trailing whitespace
+/// in the string e.g., when it is obtained from the standard input.
+/// Using the [`str::trim()`] method ensures that no whitespace remains before parsing.
+///
+/// # Example
+///
+/// ```
+/// if let Err(e) = i32::from_str_radix("a12", 10) {
+///     println!("Failed conversion to i32: {e}");
+/// }
+/// ```
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct ParseIntError {
+    pub(super) kind: IntErrorKind,
+}
+
+/// Enum to store the various types of errors that can cause parsing an integer to fail.
+///
+/// # Example
+///
+/// ```
+/// # fn main() {
+/// if let Err(e) = i32::from_str_radix("a12", 10) {
+///     println!("Failed conversion to i32: {:?}", e.kind());
+/// }
+/// # }
+/// ```
+#[stable(feature = "int_error_matching", since = "1.55.0")]
+#[derive(Debug, Clone, PartialEq, Eq)]
+#[non_exhaustive]
+pub enum IntErrorKind {
+    /// Value being parsed is empty.
+    ///
+    /// This variant will be constructed when parsing an empty string.
+    #[stable(feature = "int_error_matching", since = "1.55.0")]
+    Empty,
+    /// Contains an invalid digit in its context.
+    ///
+    /// Among other causes, this variant will be constructed when parsing a string that
+    /// contains a non-ASCII char.
+    ///
+    /// This variant is also constructed when a `+` or `-` is misplaced within a string
+    /// either on its own or in the middle of a number.
+    #[stable(feature = "int_error_matching", since = "1.55.0")]
+    InvalidDigit,
+    /// Integer is too large to store in target integer type.
+    #[stable(feature = "int_error_matching", since = "1.55.0")]
+    PosOverflow,
+    /// Integer is too small to store in target integer type.
+    #[stable(feature = "int_error_matching", since = "1.55.0")]
+    NegOverflow,
+    /// Value was Zero
+    ///
+    /// This variant will be emitted when the parsing string has a value of zero, which
+    /// would be illegal for non-zero types.
+    #[stable(feature = "int_error_matching", since = "1.55.0")]
+    Zero,
+}
+
+impl ParseIntError {
+    /// Outputs the detailed cause of parsing an integer failing.
+    #[must_use]
+    #[stable(feature = "int_error_matching", since = "1.55.0")]
+    pub fn kind(&self) -> &IntErrorKind {
+        &self.kind
+    }
+    #[unstable(
+        feature = "int_error_internals",
+        reason = "available through Error trait and this method should \
+                  not be exposed publicly",
+        issue = "none"
+    )]
+    #[doc(hidden)]
+    pub fn __description(&self) -> &str {
+        match self.kind {
+            IntErrorKind::Empty => "cannot parse integer from empty string",
+            IntErrorKind::InvalidDigit => "invalid digit found in string",
+            IntErrorKind::PosOverflow => "number too large to fit in target type",
+            IntErrorKind::NegOverflow => "number too small to fit in target type",
+            IntErrorKind::Zero => "number would be zero for non-zero type",
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Display for ParseIntError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.__description().fmt(f)
+    }
+}