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, 7 deletions

diff --git a/src/link/Lld.zig b/src/link/Lld.zig
index caf9da1ed2..6eddba2b53 100644
--- a/src/link/Lld.zig
+++ b/src/link/Lld.zig
@@ -933,9 +933,7 @@ fn elfLink(lld: *Lld, arena: Allocator) !void {
             .fast, .uuid, .sha1, .md5 => try argv.append(try std.fmt.allocPrint(arena, "--build-id={s}", .{
                 @tagName(base.build_id),
             })),
-            .hexstring => |hs| try argv.append(try std.fmt.allocPrint(arena, "--build-id=0x{s}", .{
-                std.fmt.fmtSliceHexLower(hs.toSlice()),
-            })),
+            .hexstring => |hs| try argv.append(try std.fmt.allocPrint(arena, "--build-id=0x{x}", .{hs.toSlice()})),
         }
 
         try argv.append(try std.fmt.allocPrint(arena, "--image-base={d}", .{elf.image_base}));
@@ -1511,9 +1509,7 @@ fn wasmLink(lld: *Lld, arena: Allocator) !void {
             .fast, .uuid, .sha1 => try argv.append(try std.fmt.allocPrint(arena, "--build-id={s}", .{
                 @tagName(base.build_id),
             })),
-            .hexstring => |hs| try argv.append(try std.fmt.allocPrint(arena, "--build-id=0x{s}", .{
-                std.fmt.fmtSliceHexLower(hs.toSlice()),
-            })),
+            .hexstring => |hs| try argv.append(try std.fmt.allocPrint(arena, "--build-id=0x{x}", .{hs.toSlice()})),
             .md5 => {},
         }
 
@@ -1667,7 +1663,7 @@ fn spawnLld(
                     log.warn("failed to delete response file {s}: {s}", .{ rsp_path, @errorName(err) });
                 {
                     defer rsp_file.close();
-                    var rsp_buf = std.io.bufferedWriter(rsp_file.writer());
+                    var rsp_buf = std.io.bufferedWriter(rsp_file.deprecatedWriter());
                     const rsp_writer = rsp_buf.writer();
                     for (argv[2..]) |arg| {
                         try rsp_writer.writeByte('"');