Init. Tested against cargo bench, the single-threaded consumer is confirmed working.

treefmt.toml

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+# One CLI to format the code tree - https://github.com/numtide/treefmt
+
+# Do not exit with error if a configured formatter is missing
+# Env $TREEFMT_ALLOW_MISSING_FORMATTER
+# allow-missing-formatter = true
+
+# The file into which a cpu profile will be written
+# Env $TREEFMT_CPU_PROFILE
+# cpu-profile = ./cpu.pprof
+
+# Exclude files or directories matching the specified globs
+# Env $TREEFMT_EXCLUDES
+# excludes = ["*.md", "*.gif"]
+excludes = [
+  "*.toml",
+  "*.yaml",
+  "*.md",
+  "*.nu",
+  "*.jpg",
+  "*.astro",
+  "*.css",
+  "*.webmanifest",
+  "*.svg",
+  "*.json",
+  "*.mjs",
+  "*.cjs",
+  "*.ts",
+  "*.txt",
+  "*.js",
+  "*.png",
+  "*.woff",
+  "*.woff2",
+  "*.ttf",
+  "*.kak",
+  "*.xml",
+  ".gitignore",
+  "flake.lock",
+  "examples/*",
+  ".envrc",
+  "Cargo.lock"
+]
+
+# Exit with error if any changes were made during execution
+# Useful for CI
+# Env $TREEFMT_FAIL_ON_CHANGE
+# fail-on-change = true
+
+# A list of formatters to apply
+# Defaults to all configured formatters
+# Env $TREEFMT_FORMATTERS
+# formatters = ["gofmt", "prettier"]
+
+# Log paths that did not match any formatters at the specified log level
+# Possible values are <debug|info|warn|error|fatal>
+# Env $TREEFMT_ON_UNMATCHED
+# on-unmatched = "info"
+
+# The root directory from which treefmt will start walking the filesystem
+# Defaults to the directory containing the config file
+# Env $TREEFMT_TREE_ROOT
+# tree-root = "/tmp/foo"
+
+# File to search for to find the tree root (if tree-root is not set)
+# Env $TREEFMT_TREE_ROOT_FILE
+# tree-root-file = ".git/config"
+
+# Set the verbosity of logs
+# 0 = warn, 1 = info, 2 = debug
+# Env $TREEFMT_VERBOSE
+# verbose = 2
+
+# The method used to traverse the files within the tree root
+# Currently, we support 'auto', 'git' or 'filesystem'
+# Env $TREEFMT_WALK
+# walk = "filesystem"
+
+[formatter.nix]
+command = "nix"
+options = ["fmt"]
+includes = [ "*.nix" ]
+excludes = []
+priority = 0
+
+
+[formatter.rust]
+command = "rustfmt"
+options = [ "--config", "skip_children=true", "--edition", "2021" ]
+includes = [ "*.rs" ]
+excludes = []
+priority = 0