mirror of https://github.com/rust-lang/rust
135 lines
4.0 KiB
Rust
135 lines
4.0 KiB
Rust
//@ aux-build:expand-expr.rs
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// no-remap-src-base: check_expand_expr_file!() fails when enabled.
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#![feature(concat_bytes)]
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extern crate expand_expr;
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use expand_expr::{
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check_expand_expr_file, echo_pm, expand_expr_fail, expand_expr_is, recursive_expand,
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};
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// Check builtin macros can be expanded.
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expand_expr_is!(13u32, line!());
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expand_expr_is!(24u32, column!());
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expand_expr_is!("Hello, World!", concat!("Hello, ", "World", "!"));
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expand_expr_is!("int10floats5.3booltrue", concat!("int", 10, "floats", 5.3, "bool", true));
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expand_expr_is!("Hello", concat!(r##"Hello"##));
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expand_expr_is!("Included file contents\n", include_str!("auxiliary/included-file.txt"));
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expand_expr_is!(b"Included file contents\n", include_bytes!("auxiliary/included-file.txt"));
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expand_expr_is!(
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"contents: Included file contents\n",
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concat!("contents: ", include_str!("auxiliary/included-file.txt"))
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);
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expand_expr_is!(
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b"contents: Included file contents\n",
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concat_bytes!(b"contents: ", include_bytes!("auxiliary/included-file.txt"))
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);
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// Correct value is checked for multiple sources.
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check_expand_expr_file!(file!());
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expand_expr_is!("hello", stringify!(hello));
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expand_expr_is!("10 + 20", stringify!(10 + 20));
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macro_rules! echo_tts {
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($($t:tt)*) => { $($t)* };
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}
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macro_rules! echo_lit {
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($l:literal) => {
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$l
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};
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}
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macro_rules! echo_expr {
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($e:expr) => {
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$e
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};
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}
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macro_rules! simple_lit {
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($l:literal) => {
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expand_expr_is!($l, $l);
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expand_expr_is!($l, echo_lit!($l));
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expand_expr_is!($l, echo_expr!($l));
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expand_expr_is!($l, echo_tts!($l));
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expand_expr_is!($l, echo_pm!($l));
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const _: () = {
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macro_rules! mac {
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() => {
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$l
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};
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}
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expand_expr_is!($l, mac!());
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expand_expr_is!($l, echo_expr!(mac!()));
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expand_expr_is!($l, echo_tts!(mac!()));
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expand_expr_is!($l, echo_pm!(mac!()));
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};
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};
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}
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simple_lit!("Hello, World");
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simple_lit!('c');
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simple_lit!(b'c');
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simple_lit!(10);
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simple_lit!(10.0);
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simple_lit!(10.0f64);
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simple_lit!(-3.14159);
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simple_lit!(-3.5e10);
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simple_lit!(0xFEED);
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simple_lit!(-0xFEED);
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simple_lit!(0b0100);
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simple_lit!(-0b0100);
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simple_lit!("string");
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simple_lit!(r##"raw string"##);
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simple_lit!(b"byte string");
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simple_lit!(br##"raw byte string"##);
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simple_lit!(true);
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simple_lit!(false);
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// Ensure char escapes aren't normalized by expansion
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simple_lit!("\u{0}");
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simple_lit!("\0");
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simple_lit!("\x00");
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simple_lit!('\u{0}');
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simple_lit!('\0');
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simple_lit!('\x00');
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simple_lit!(b"\x00");
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simple_lit!(b"\0");
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simple_lit!(b'\x00');
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simple_lit!(b'\0');
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// Extra tokens after the string literal aren't ignored
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expand_expr_fail!("string"; hello); //~ ERROR: expected one of `.`, `?`, or an operator, found `;`
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// Invalid expressions produce errors in addition to returning `Err(())`.
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expand_expr_fail!($); //~ ERROR: expected expression, found `$`
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expand_expr_fail!(echo_tts!($)); //~ ERROR: expected expression, found `$`
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expand_expr_fail!(echo_pm!($)); //~ ERROR: expected expression, found `$`
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// We get errors reported and recover during macro expansion if the macro
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// doesn't produce a valid expression.
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expand_expr_is!("string", echo_tts!("string"; hello)); //~ ERROR: macro expansion ignores token `hello` and any following
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expand_expr_is!("string", echo_pm!("string"; hello)); //~ ERROR: macro expansion ignores token `;` and any following
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// For now, fail if a non-literal expression is expanded.
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expand_expr_fail!(arbitrary_expression() + "etc");
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expand_expr_fail!(echo_tts!(arbitrary_expression() + "etc"));
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expand_expr_fail!(echo_expr!(arbitrary_expression() + "etc"));
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expand_expr_fail!(echo_pm!(arbitrary_expression() + "etc"));
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const _: u32 = recursive_expand!(); //~ ERROR: recursion limit reached while expanding `recursive_expand!`
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fn main() {
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// https://github.com/rust-lang/rust/issues/104414
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match b"Included file contents\n" {
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include_bytes!("auxiliary/included-file.txt") => (),
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_ => panic!("include_bytes! in pattern"),
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}
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}
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