[libc++] Implement format_error.
This is the first step at implementing <format>. It adds the <format> header
and implements the `format_error`. class.
Implemnts parts of:
-P0645 Text Formatting
Reviewed By: ldionne, #libc, miscco, curdeius
Differential Revision: https://reviews.llvm.org/D92214
GitOrigin-RevId: 081c1db02dd2b48cf736d44862f7d7e8c2869577
diff --git a/include/module.modulemap b/include/module.modulemap
index 750cd38..56b49c4 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -292,6 +292,10 @@
header "filesystem"
export *
}
+ module format {
+ header "format"
+ export *
+ }
module forward_list {
header "forward_list"
export initializer_list