f Add UNSTABLE nice-to-haves

We add some unstable featues that might be nice to have, but are
currently unstable. So we probably don't want to use them right away.

Author: tnull

rustfmt.toml

@@ -1,8 +1,13 @@
-hard_tabs = true # use tab characters for indentation, spaces for alignment
-use_field_init_shorthand = true
-chain_width = 100
-max_width = 100
 use_small_heuristics = "Max"
 fn_params_layout = "Compressed"
+hard_tabs = true
+use_field_init_shorthand = true
+max_width = 100
+chain_width = 100
 match_block_trailing_comma = true
-overflow_delimited_expr = true
+# UNSTABLE: format_code_in_doc_comments = true
+# UNSTABLE: overflow_delimited_expr = true
+# UNSTABLE: comment_width = 100
+# UNSTABLE: format_macro_matchers = true
+# UNSTABLE: format_strings = true
+# UNSTABLE: group_imports = "StdExternalCrate"