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.gitattributes
alias-uninit-value.rs
anonymous-higher-ranked-lifetime.rs
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artificial-block.rs
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assign-assign.rs
assign-imm-local-twice.rs
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paren-span.rs
paren-span.stderr
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partialeq_help.stderr
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path-lookahead.stderr
path.rs
paths-containing-nul.rs
phantom-auto-trait.rs
phantom-auto-trait.stderr
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pptypedef.stderr
primitive-binop-lhs-mut.rs
print-stdout-eprint-stderr.rs
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ptr-coercion.rs
ptr-coercion.stderr
query-visibility.rs
raw-str.rs
README.md
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reassign-ref-mut.rs
reassign-ref-mut.stderr
reexport-test-harness-main.rs
removing-extern-crate.fixed
removing-extern-crate.rs
removing-extern-crate.stderr
resource-assign-is-not-copy.rs
resource-destruct.rs
rustc-error.rs
rustc-error.stderr
seq-args.rs
seq-args.stderr
shadow-bool.rs
shadowed-use-visibility.rs
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short-error-format.stderr
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sized-cycle-note.rs
sized-cycle-note.stderr
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tail-typeck.rs
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trait-method-number-parameters.rs
trait-method-number-parameters.stderr
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transmute-non-immediate-to-immediate.rs
trivial_casts-rpass.rs
trivial_casts-rpass.stderr
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try-operator.rs
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type-namespace.rs
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type-param.rs
type-ptr.rs
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type_length_limit.polonius.stderr
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unconstrained-ref.stderr
underscore-ident-matcher.rs
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underscore-method-after-integer.rs
unevaluated_fixed_size_array_len.rs
unevaluated_fixed_size_array_len.stderr
uninit-empty-types.rs
unit.rs
unknown-language-item.rs
unknown-language-item.stderr
unknown-llvm-arg.rs
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unnamed_argument_mode.rs
unreachable-code-1.rs
unreachable-code.rs
unsigned-literal-negation.rs
unsigned-literal-negation.stderr
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unwind-no-uwtable.rs
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use-module-level-int-consts.rs
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used.rs
used.stderr
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usize-generic-argument-parent.rs
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utf8_idents.rs
wait-forked-but-failed-child.rs
walk-struct-literal-with.rs
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weird-exit-code.rs
weird-exprs.rs
windows-subsystem-invalid.rs
windows-subsystem-invalid.stderr
write-fmt-errors.rs
writing-to-immutable-vec.rs
writing-to-immutable-vec.stderr
wrong-hashset-issue-42918.rs

README.md

UI Tests

This folder contains rustc's UI tests.

Test Directives (Headers)

Typically, a UI test will have some test directives / headers which are special comments that tell compiletest how to build and intepret a test.

As part of an on-going effort to rewrite compiletest (see https://github.com/rust-lang/compiler-team/issues/536), a major change proposal to change legacy compiletest-style headers // <directive> to ui_test-style headers //@ <directive> was accepted (see https://github.com/rust-lang/compiler-team/issues/512.

An example directive is ignore-test. In legacy compiletest style, the header would be written as

// ignore-test

but in ui_test style, the header would be written as

//@ ignore-test

compiletest is changed to accept only //@ directives for UI tests (currently), and will reject and report an error if it encounters any comments // <content> that may be parsed as an legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.