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https://github.com/rust-lang/rust
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9a63a42cb7
This span records the declaration of the metavariable in the LHS of the macro. It's used in a couple of error messages. Unfortunately, it gets in the way of the long-term goal of removing `TokenKind::Interpolated`. So this commit removes it, which degrades a couple of (obscure) error messages but makes things simpler and enables the next commit.
115 lines
4 KiB
Plaintext
115 lines
4 KiB
Plaintext
error: no rules expected the token `bcd`
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--> $DIR/trace_faulty_macros.rs:7:26
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LL | macro_rules! my_faulty_macro {
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| ---------------------------- when calling this macro
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LL | () => {
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LL | my_faulty_macro!(bcd);
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| ^^^ no rules expected this token in macro call
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...
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LL | my_faulty_macro!();
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| ------------------ in this macro invocation
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= note: while trying to match end of macro
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= note: this error originates in the macro `my_faulty_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
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note: trace_macro
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--> $DIR/trace_faulty_macros.rs:31:5
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LL | my_faulty_macro!();
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| ^^^^^^^^^^^^^^^^^^
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= note: expanding `my_faulty_macro! { }`
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= note: to `my_faulty_macro! (bcd);`
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= note: expanding `my_faulty_macro! { bcd }`
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error: recursion limit reached while expanding `my_recursive_macro!`
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--> $DIR/trace_faulty_macros.rs:22:9
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LL | my_recursive_macro!();
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| ^^^^^^^^^^^^^^^^^^^^^
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...
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LL | my_recursive_macro!();
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| --------------------- in this macro invocation
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= help: consider increasing the recursion limit by adding a `#![recursion_limit = "8"]` attribute to your crate (`trace_faulty_macros`)
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= note: this error originates in the macro `my_recursive_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
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note: trace_macro
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--> $DIR/trace_faulty_macros.rs:32:5
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LL | my_recursive_macro!();
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| ^^^^^^^^^^^^^^^^^^^^^
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= note: expanding `my_recursive_macro! { }`
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= note: to `my_recursive_macro! ();`
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= note: expanding `my_recursive_macro! { }`
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= note: to `my_recursive_macro! ();`
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= note: expanding `my_recursive_macro! { }`
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= note: to `my_recursive_macro! ();`
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= note: expanding `my_recursive_macro! { }`
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= note: to `my_recursive_macro! ();`
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error: expected expression, found pattern `A { a: a, b: 0, c: _, .. }`
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--> $DIR/trace_faulty_macros.rs:16:9
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LL | $a
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| ^^ expected expression
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...
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LL | let a = pat_macro!();
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| ------------ in this macro invocation
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= note: this error originates in the macro `pat_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
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--> $DIR/trace_faulty_macros.rs:42:1
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LL | #[derive(Debug)]
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| ^^^^^^^^^^^^^^^^ not applicable here
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LL | fn use_derive_macro_as_attr() {}
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| -------------------------------- not a `struct`, `enum` or `union`
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error: expected expression, found pattern `1 + 1`
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--> $DIR/trace_faulty_macros.rs:49:37
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LL | (let $p:pat = $e:expr) => {test!(($p,$e))};
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| -- this is interpreted as expression, but it is expected to be pattern
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...
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LL | (($p:pat, $e:pat)) => {let $p = $e;};
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| ^^ expected expression
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...
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LL | test!(let x = 1+1);
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| ------------------
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| | |
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| | this is expected to be expression
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| in this macro invocation
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= note: when forwarding a matched fragment to another macro-by-example, matchers in the second macro will see an opaque AST of the fragment type, not the underlying tokens
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= note: this error originates in the macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
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note: trace_macro
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--> $DIR/trace_faulty_macros.rs:36:13
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LL | let a = pat_macro!();
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| ^^^^^^^^^^^^
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= note: expanding `pat_macro! { }`
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= note: to `pat_macro! (A { a : a, b : 0, c : _, .. });`
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= note: expanding `pat_macro! { A { a : a, b : 0, c : _, .. } }`
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= note: to `A { a: a, b: 0, c: _, .. }`
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note: trace_macro
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--> $DIR/trace_faulty_macros.rs:53:5
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LL | test!(let x = 1+1);
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| ^^^^^^^^^^^^^^^^^^
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= note: expanding `test! { let x = 1+1 }`
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= note: to `test! ((x, 1 + 1))`
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= note: expanding `test! { (x, 1 + 1) }`
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= note: to `let x = 1 + 1;`
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error: aborting due to 5 previous errors
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For more information about this error, try `rustc --explain E0774`.
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