rustfmt.toml

# Run rustfmt with this config (it should be picked up automatically).
version = "Two"
use_small_heuristics = "Max"
merge_derives = false

# by default we ignore everything in the repository
# tidy only checks files which are not ignored, each entry follows gitignore style
ignore = [
    "/build/",
    "/*-build/",
    "/build-*/",
    "/vendor/",

    # tests for now are not formatted, as they are sometimes pretty-printing constrained
    # (and generally rustfmt can move around comments in UI-testing incompatible ways)
    "tests",

    # do not format submodules
    # FIXME: sync submodule list with tidy/bootstrap/etc
    # tidy/src/walk.rs:filter_dirs
    "library/backtrace",
    "library/portable-simd",
    "library/stdarch",
    "compiler/rustc_codegen_gcc",
    "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/miri",
    "src/tools/rust-analyzer",
    "src/tools/rustfmt",

    # these are ignored by a standard cargo fmt run
    "compiler/rustc_codegen_cranelift/y.rs", # running rustfmt breaks this file
    "compiler/rustc_codegen_cranelift/scripts",
    "compiler/rustc_codegen_cranelift/example/gen_block_iterate.rs", # uses edition 2024
]