self-hosted: fix the rest of the compile errors

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/std/fs/file.zig b/lib/std/fs/file.zig
index a33d0d8e3e..9d72733395 100644
--- a/lib/std/fs/file.zig
+++ b/lib/std/fs/file.zig
@@ -527,19 +527,21 @@ pub const File = struct {
         }
     }
 
-    pub fn copyRange(in: File, in_offset: u64, out: File, out_offset: u64, len: usize) PWriteError!usize {
+    pub const CopyRangeError = PWriteError || PReadError;
+
+    pub fn copyRange(in: File, in_offset: u64, out: File, out_offset: u64, len: usize) CopyRangeError!usize {
         // TODO take advantage of copy_file_range OS APIs
         var buf: [8 * 4096]u8 = undefined;
         const adjusted_count = math.min(buf.len, len);
         const amt_read = try in.pread(buf[0..adjusted_count], in_offset);
-        if (amt_read == 0) return 0;
+        if (amt_read == 0) return @as(usize, 0);
         return out.pwrite(buf[0..amt_read], out_offset);
     }
 
     /// Returns the number of bytes copied. If the number read is smaller than `buffer.len`, it
     /// means the in file reached the end. Reaching the end of a file is not an error condition.
-    pub fn copyRangeAll(in: File, in_offset: u64, out: File, out_offset: u64, len: usize) PWriteError!usize {
-        var total_bytes_copied = 0;
+    pub fn copyRangeAll(in: File, in_offset: u64, out: File, out_offset: u64, len: usize) CopyRangeError!usize {
+        var total_bytes_copied: usize = 0;
         var in_off = in_offset;
         var out_off = out_offset;
         while (total_bytes_copied < len) {
@@ -549,6 +551,7 @@ pub const File = struct {
             in_off += amt_copied;
             out_off += amt_copied;
         }
+        return total_bytes_copied;
     }
 
     pub const WriteFileOptions = struct {