rustfmt.toml

# Run rustfmt with this config (it should be picked up automatically).
style_edition = "2024"
use_small_heuristics = "Max"
merge_derives = false
group_imports = "StdExternalCrate"
imports_granularity = "Module"
use_field_init_shorthand = true

# Files to ignore. Each entry uses gitignore syntax, but `!` prefixes aren't allowed.
ignore = [
    "/build/",
    "/*-build/",
    "/build-*/",
    "/vendor/",

    # Some tests are not formatted, for various reasons.
    "/tests/codegen/simd-intrinsic/", # Many types like `u8x64` are better hand-formatted.
    "/tests/crashes/",                # Many of these tests contain syntax errors.
    "/tests/debuginfo/",              # These tests are somewhat sensitive to source code layout.
    "/tests/incremental/",            # These tests are somewhat sensitive to source code layout.
    "/tests/pretty/",                 # These tests are very sensitive to source code layout.
    "/tests/run-make/export",         # These tests contain syntax errors.
    "/tests/run-make/translation/test.rs", # This test contains syntax errors.
    "/tests/rustdoc/",                # Some have syntax errors, some are whitespace-sensitive.
    "/tests/rustdoc-gui/",            # Some tests are sensitive to source code layout.
    "/tests/rustdoc-ui/",             # Some have syntax errors, some are whitespace-sensitive.
    "/tests/ui/",                     # Some have syntax errors, some are whitespace-sensitive.
    "/tests/ui-fulldeps/",            # Some are whitespace-sensitive (e.g. `// ~ERROR` comments).

    # Do not format submodules.
    "library/backtrace",
    "library/compiler-builtins",
    "library/portable-simd",
    "library/stdarch",
    "src/doc/book",
    "src/doc/edition-guide",
    "src/doc/embedded-book",
    "src/doc/nomicon",
    "src/doc/reference",
    "src/doc/rust-by-example",
    "src/doc/rustc-dev-guide",
    "src/llvm-project",
    "src/tools/cargo",
    "src/tools/clippy",
    "src/tools/enzyme",
    "src/tools/miri",
    "src/tools/rust-analyzer",
    "src/tools/rustc-perf",
    "src/tools/rustfmt",
    "src/gcc",

    # These are ignored by a standard cargo fmt run.
    "compiler/rustc_codegen_cranelift/scripts",
    "compiler/rustc_codegen_gcc/tests",
    # Code automatically generated and included.
    "compiler/rustc_codegen_gcc/src/intrinsic/archs.rs",
    "compiler/rustc_codegen_gcc/example",

    # Rustfmt doesn't support use closures yet
    "tests/mir-opt/ergonomic-clones/closure.rs",
    "tests/codegen/ergonomic-clones/closure.rs",
]