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

2 files changed, 3 insertions, 3 deletions

diff --git a/src/libs/libtsan.zig b/src/libs/libtsan.zig
index de5a770e30..d17baf8fa1 100644
--- a/src/libs/libtsan.zig
+++ b/src/libs/libtsan.zig
@@ -268,7 +268,7 @@ pub fn buildTsan(comp: *Compilation, prog_node: std.Progress.Node) BuildError!vo
     const skip_linker_dependencies = !target.os.tag.isDarwin();
     const linker_allow_shlib_undefined = target.os.tag.isDarwin();
     const install_name = if (target.os.tag.isDarwin())
-        try std.fmt.allocPrintZ(arena, "@rpath/{s}", .{basename})
+        try std.fmt.allocPrintSentinel(arena, "@rpath/{s}", .{basename}, 0)
     else
         null;
     // Workaround for https://github.com/llvm/llvm-project/issues/97627
diff --git a/src/libs/mingw.zig b/src/libs/mingw.zig
index e2bcb19f08..1c2927eba0 100644
--- a/src/libs/mingw.zig
+++ b/src/libs/mingw.zig
@@ -306,7 +306,7 @@ pub fn buildImportLib(comp: *Compilation, lib_name: []const u8) !void {
     if (comp.verbose_cc) print: {
         std.debug.lockStdErr();
         defer std.debug.unlockStdErr();
-        const stderr = std.fs.File.stderr().writer();
+        const stderr = std.fs.File.stderr().deprecatedWriter();
         nosuspend stderr.print("def file: {s}\n", .{def_file_path}) catch break :print;
         nosuspend stderr.print("include dir: {s}\n", .{include_dir}) catch break :print;
         nosuspend stderr.print("output path: {s}\n", .{def_final_path}) catch break :print;
@@ -335,7 +335,7 @@ pub fn buildImportLib(comp: *Compilation, lib_name: []const u8) !void {
         // new scope to ensure definition file is written before passing the path to WriteImportLibrary
         const def_final_file = try o_dir.createFile(final_def_basename, .{ .truncate = true });
         defer def_final_file.close();
-        try pp.prettyPrintTokens(def_final_file.writer(), .result_only);
+        try pp.prettyPrintTokens(def_final_file.deprecatedWriter(), .result_only);
     }
 
     const lib_final_path = try std.fs.path.join(gpa, &.{ "o", &digest, final_lib_basename });