Vendor things

third-party/vendor/memmap2/examples/cat.rs

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+extern crate memmap2;
+
+use std::env;
+use std::fs::File;
+use std::io::{self, Write};
+
+use memmap2::Mmap;
+
+/// Output a file's contents to stdout. The file path must be provided as the first process
+/// argument.
+fn main() {
+    let path = env::args()
+        .nth(1)
+        .expect("supply a single path as the program argument");
+
+    let file = File::open(path).expect("failed to open the file");
+
+    let mmap = unsafe { Mmap::map(&file).expect("failed to map the file") };
+
+    io::stdout()
+        .write_all(&mmap[..])
+        .expect("failed to output the file contents");
+}