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, 2 insertions, 2 deletions

diff --git a/src/link/LdScript.zig b/src/link/LdScript.zig
index ed5dbc4681..534f9766bb 100644
--- a/src/link/LdScript.zig
+++ b/src/link/LdScript.zig
@@ -41,8 +41,8 @@ pub fn parse(
         try line_col.append(gpa, .{ .line = line, .column = column });
         switch (tok.id) {
             .invalid => {
-                return diags.failParse(path, "invalid token in LD script: '{s}' ({d}:{d})", .{
-                    std.fmt.fmtSliceEscapeLower(tok.get(data)), line, column,
+                return diags.failParse(path, "invalid token in LD script: '{f}' ({d}:{d})", .{
+                    std.ascii.hexEscape(tok.get(data), .lower), line, column,
                 });
             },
             .new_line => {