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, 6 insertions, 6 deletions

diff --git a/lib/std/Build.zig b/lib/std/Build.zig
index df5a323572..12097bf404 100644
--- a/lib/std/Build.zig
+++ b/lib/std/Build.zig
@@ -1745,7 +1745,7 @@ pub fn addUserInputOption(b: *Build, name_raw: []const u8, value_raw: []const u8
             return true;
         },
         .lazy_path, .lazy_path_list => {
-            log.warn("the lazy path value type isn't added from the CLI, but somehow '{s}' is a .{}", .{ name, std.zig.fmtId(@tagName(gop.value_ptr.value)) });
+            log.warn("the lazy path value type isn't added from the CLI, but somehow '{s}' is a .{f}", .{ name, std.zig.fmtId(@tagName(gop.value_ptr.value)) });
             return true;
         },
     }
@@ -2059,7 +2059,7 @@ pub fn runAllowFail(
     try Step.handleVerbose2(b, null, child.env_map, argv);
     try child.spawn();
 
-    const stdout = child.stdout.?.reader().readAllAlloc(b.allocator, max_output_size) catch {
+    const stdout = child.stdout.?.deprecatedReader().readAllAlloc(b.allocator, max_output_size) catch {
         return error.ReadFailure;
     };
     errdefer b.allocator.free(stdout);
@@ -2770,7 +2770,7 @@ fn dumpBadDirnameHelp(
     defer debug.unlockStdErr();
 
     const stderr: fs.File = .stderr();
-    const w = stderr.writer();
+    const w = stderr.deprecatedWriter();
     try w.print(msg, args);
 
     const tty_config = std.io.tty.detectConfig(stderr);
@@ -2785,7 +2785,7 @@ fn dumpBadDirnameHelp(
 
     if (asking_step) |as| {
         tty_config.setColor(w, .red) catch {};
-        try stderr.writer().print("    The step '{s}' that is missing a dependency on the above step was created by this stack trace:\n", .{as.name});
+        try stderr.deprecatedWriter().print("    The step '{s}' that is missing a dependency on the above step was created by this stack trace:\n", .{as.name});
         tty_config.setColor(w, .reset) catch {};
 
         as.dump(stderr);
@@ -2803,7 +2803,7 @@ pub fn dumpBadGetPathHelp(
     src_builder: *Build,
     asking_step: ?*Step,
 ) anyerror!void {
-    const w = stderr.writer();
+    const w = stderr.deprecatedWriter();
     try w.print(
         \\getPath() was called on a GeneratedFile that wasn't built yet.
         \\  source package path: {s}
@@ -2822,7 +2822,7 @@ pub fn dumpBadGetPathHelp(
     s.dump(stderr);
     if (asking_step) |as| {
         tty_config.setColor(w, .red) catch {};
-        try stderr.writer().print("    The step '{s}' that is missing a dependency on the above step was created by this stack trace:\n", .{as.name});
+        try stderr.deprecatedWriter().print("    The step '{s}' that is missing a dependency on the above step was created by this stack trace:\n", .{as.name});
         tty_config.setColor(w, .reset) catch {};
 
         as.dump(stderr);