std.fmt: breaking API changes

added adapter to AnyWriter and GenericWriter to help bridge the gap
between old and new API

make std.testing.expectFmt work at compile-time

std.fmt no longer has a dependency on std.unicode. Formatted printing
was never properly unicode-aware. Now it no longer pretends to be.

Breakage/deprecations:
* std.fs.File.reader -> std.fs.File.deprecatedReader
* std.fs.File.writer -> std.fs.File.deprecatedWriter
* std.io.GenericReader -> std.io.Reader
* std.io.GenericWriter -> std.io.Writer
* std.io.AnyReader -> std.io.Reader
* std.io.AnyWriter -> std.io.Writer
* std.fmt.format -> std.fmt.deprecatedFormat
* std.fmt.fmtSliceEscapeLower -> std.ascii.hexEscape
* std.fmt.fmtSliceEscapeUpper -> std.ascii.hexEscape
* std.fmt.fmtSliceHexLower -> {x}
* std.fmt.fmtSliceHexUpper -> {X}
* std.fmt.fmtIntSizeDec -> {B}
* std.fmt.fmtIntSizeBin -> {Bi}
* std.fmt.fmtDuration -> {D}
* std.fmt.fmtDurationSigned -> {D}
* {} -> {f} when there is a format method
* format method signature
  - anytype -> *std.io.Writer
  - inferred error set -> error{WriteFailed}
  - options -> (deleted)
* std.fmt.Formatted
  - now takes context type explicitly
  - no fmt string

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/std/Thread.zig b/lib/std/Thread.zig
index bb46bd3f24..fd2111da71 100644
--- a/lib/std/Thread.zig
+++ b/lib/std/Thread.zig
@@ -167,7 +167,7 @@ pub fn setName(self: Thread, name: []const u8) SetNameError!void {
             const file = try std.fs.cwd().openFile(path, .{ .mode = .write_only });
             defer file.close();
 
-            try file.writer().writeAll(name);
+            try file.deprecatedWriter().writeAll(name);
             return;
         },
         .windows => {
@@ -281,7 +281,7 @@ pub fn getName(self: Thread, buffer_ptr: *[max_name_len:0]u8) GetNameError!?[]co
             const file = try std.fs.cwd().openFile(path, .{});
             defer file.close();
 
-            const data_len = try file.reader().readAll(buffer_ptr[0 .. max_name_len + 1]);
+            const data_len = try file.deprecatedReader().readAll(buffer_ptr[0 .. max_name_len + 1]);
 
             return if (data_len >= 1) buffer[0 .. data_len - 1] else null;
         },
@@ -1163,7 +1163,7 @@ const LinuxThreadImpl = struct {
 
     fn getCurrentId() Id {
         return tls_thread_id orelse {
-            const tid = @as(u32, @bitCast(linux.gettid()));
+            const tid: u32 = @bitCast(linux.gettid());
             tls_thread_id = tid;
             return tid;
         };