test: disable some tests on non-64-bit

Some doc tests make 64-bit assumptions and fail on 32-bit. I'd be open
to perhaps refactoring the tests somehow to make them work on both, but
I literally have no easy way to run doc tests in a 32-bit environment.
Without being able to actually run them myself, I don't feel comfortable
doing anything other than squashing the tests in that case.

Closes #1041

Author: BurntSushi

regex-lite/src/string.rs

@@ -2063,6 +2063,7 @@ impl<'h, 'n> core::ops::Index<&'n str> for Captures<'h> {
 /// This example shows how to create and use `CaptureLocations` in a search.
 ///
 /// ```
+/// # if !cfg!(target_pointer_width = "64") { return; } // see #1041
 /// use regex_lite::Regex;
 ///
 /// let re = Regex::new(r"(?<first>\w+)\s+(?<last>\w+)").unwrap();

src/builders.rs

@@ -679,6 +679,7 @@ pub(crate) mod string {
         /// # Example
         ///
         /// ```
+        /// # if !cfg!(target_pointer_width = "64") { return; } // see #1041
         /// use regex::RegexBuilder;
         ///
         /// // It may surprise you how big some seemingly small patterns can
@@ -1246,6 +1247,7 @@ pub(crate) mod string {
         /// # Example
         ///
         /// ```
+        /// # if !cfg!(target_pointer_width = "64") { return; } // see #1041
         /// use regex::RegexSetBuilder;
         ///
         /// // It may surprise you how big some seemingly small patterns can
@@ -1856,6 +1858,7 @@ pub(crate) mod bytes {
         /// # Example
         ///
         /// ```
+        /// # if !cfg!(target_pointer_width = "64") { return; } // see #1041
         /// use regex::bytes::RegexBuilder;
         ///
         /// // It may surprise you how big some seemingly small patterns can
@@ -2428,6 +2431,7 @@ pub(crate) mod bytes {
         /// # Example
         ///
         /// ```
+        /// # if !cfg!(target_pointer_width = "64") { return; } // see #1041
         /// use regex::bytes::RegexSetBuilder;
         ///
         /// // It may surprise you how big some seemingly small patterns can

src/regex/bytes.rs

@@ -2025,6 +2025,7 @@ impl<'h, 'n> core::ops::Index<&'n str> for Captures<'h> {
 /// This example shows how to create and use `CaptureLocations` in a search.
 ///
 /// ```
+/// # if !cfg!(target_pointer_width = "64") { return; } // see #1041
 /// use regex::bytes::Regex;
 ///
 /// let re = Regex::new(r"(?<first>\w+)\s+(?<last>\w+)").unwrap();

src/regex/string.rs

@@ -2028,6 +2028,7 @@ impl<'h, 'n> core::ops::Index<&'n str> for Captures<'h> {
 /// This example shows how to create and use `CaptureLocations` in a search.
 ///
 /// ```
+/// # if !cfg!(target_pointer_width = "64") { return; } // see #1041
 /// use regex::Regex;
 ///
 /// let re = Regex::new(r"(?<first>\w+)\s+(?<last>\w+)").unwrap();