Auto merge of #38648 - utkarshkukreti:question-mark-in-libstd-documentation-examples, r=pnkfelix,steveklabnik,frewsxcvx

libstd: replace all `try!` with `?` in documentation examples

See #38644.

For the record, I used the following Perl one-liner and then manually fixed a couple of things it got wrong:

    $ perl -p -i -e 's#(///.*)try!\((.*)\)#$1$2?#' src/libstd/**/*.rs

3 files changed, 12 insertions, 12 deletions

diff --git a/src/libstd/sys/redox/ext/fs.rs b/src/libstd/sys/redox/ext/fs.rs
index b4e220971fd..7ad8d27b483 100644
--- a/src/libstd/sys/redox/ext/fs.rs
+++ b/src/libstd/sys/redox/ext/fs.rs
@@ -30,8 +30,8 @@ pub trait PermissionsExt {
     /// use std::fs::File;
     /// use std::os::unix::fs::PermissionsExt;
     ///
-    /// let f = try!(File::create("foo.txt"));
-    /// let metadata = try!(f.metadata());
+    /// let f = File::create("foo.txt")?;
+    /// let metadata = f.metadata()?;
     /// let permissions = metadata.permissions();
     ///
     /// println!("permissions: {}", permissions.mode());
@@ -47,8 +47,8 @@ pub trait PermissionsExt {
     /// use std::fs::File;
     /// use std::os::unix::fs::PermissionsExt;
     ///
-    /// let f = try!(File::create("foo.txt"));
-    /// let metadata = try!(f.metadata());
+    /// let f = File::create("foo.txt")?;
+    /// let metadata = f.metadata()?;
     /// let mut permissions = metadata.permissions();
     ///
     /// permissions.set_mode(0o644); // Read/write for owner and read for others.
@@ -260,7 +260,7 @@ impl FileTypeExt for fs::FileType {
 /// use std::os::unix::fs;
 ///
 /// # fn foo() -> std::io::Result<()> {
-/// try!(fs::symlink("a.txt", "b.txt"));
+/// fs::symlink("a.txt", "b.txt")?;
 /// # Ok(())
 /// # }
 /// ```
diff --git a/src/libstd/sys/unix/ext/fs.rs b/src/libstd/sys/unix/ext/fs.rs
index 900f463fa83..17de46636b5 100644
--- a/src/libstd/sys/unix/ext/fs.rs
+++ b/src/libstd/sys/unix/ext/fs.rs
@@ -77,8 +77,8 @@ pub trait PermissionsExt {
     /// use std::fs::File;
     /// use std::os::unix::fs::PermissionsExt;
     ///
-    /// let f = try!(File::create("foo.txt"));
-    /// let metadata = try!(f.metadata());
+    /// let f = File::create("foo.txt")?;
+    /// let metadata = f.metadata()?;
     /// let permissions = metadata.permissions();
     ///
     /// println!("permissions: {}", permissions.mode());
@@ -94,8 +94,8 @@ pub trait PermissionsExt {
     /// use std::fs::File;
     /// use std::os::unix::fs::PermissionsExt;
     ///
-    /// let f = try!(File::create("foo.txt"));
-    /// let metadata = try!(f.metadata());
+    /// let f = File::create("foo.txt")?;
+    /// let metadata = f.metadata()?;
     /// let mut permissions = metadata.permissions();
     ///
     /// permissions.set_mode(0o644); // Read/write for owner and read for others.
@@ -335,7 +335,7 @@ impl DirEntryExt for fs::DirEntry {
 /// use std::os::unix::fs;
 ///
 /// # fn foo() -> std::io::Result<()> {
-/// try!(fs::symlink("a.txt", "b.txt"));
+/// fs::symlink("a.txt", "b.txt")?;
 /// # Ok(())
 /// # }
 /// ```
diff --git a/src/libstd/sys/windows/ext/fs.rs b/src/libstd/sys/windows/ext/fs.rs
index 7fc04ad69d6..c63dd8a47ca 100644
--- a/src/libstd/sys/windows/ext/fs.rs
+++ b/src/libstd/sys/windows/ext/fs.rs
@@ -257,7 +257,7 @@ impl MetadataExt for Metadata {
 /// use std::os::windows::fs;
 ///
 /// # fn foo() -> std::io::Result<()> {
-/// try!(fs::symlink_file("a.txt", "b.txt"));
+/// fs::symlink_file("a.txt", "b.txt")?;
 /// # Ok(())
 /// # }
 /// ```
@@ -278,7 +278,7 @@ pub fn symlink_file<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q)
 /// use std::os::windows::fs;
 ///
 /// # fn foo() -> std::io::Result<()> {
-/// try!(fs::symlink_file("a", "b"));
+/// fs::symlink_file("a", "b")?;
 /// # Ok(())
 /// # }
 /// ```