Adopt nightly rustfmt

.justfile

@@ -62,7 +62,7 @@ alias qo := quick-test-cover-watch
 # Format all files
 [group: 'develop']
 format:
-    cargo fmt
+    cargo +nightly fmt
 
 alias f := format
 
@@ -162,7 +162,7 @@ alias do := doc-open
 # Assess formatting
 [group: 'assess']
 format-assess:
-    cargo fmt -- --check
+    cargo +nightly fmt -- --check
 
 alias fc := format-assess
 

.rustfmt.toml

@@ -1,12 +1,14 @@
+unstable_features = true
 match_block_trailing_comma = true
 max_width = 80
 reorder_imports = false
 reorder_modules = false
 use_field_init_shorthand = true
 use_try_shorthand = true
+skip_macro_invocations = ["concat"]
 
-# blank_lines_lower_bound = 1
 # not stabilized yet
+# blank_lines_lower_bound = 1
 # where_single_line = true
 # overflow_delimited_expr = true
 # normalize_doc_attributes = true