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Simplify proc macro signature validity check

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This commit is contained in:
Michael Goulet 2023-03-14 18:43:37 +00:00
parent 669e751639
commit 9eae77381e
17 changed files with 186 additions and 282 deletions
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1
Cargo.lock
View File

@ -5139,6 +5139,7 @@ dependencies = [
"rustc_session",
"rustc_span",
"rustc_target",
"rustc_trait_selection",
"tracing",
]

1
compiler/rustc_passes/Cargo.toml
View File

@ -22,3 +22,4 @@ rustc_span = { path = "../rustc_span" }
rustc_lexer = { path = "../rustc_lexer" }
rustc_ast_pretty = { path = "../rustc_ast_pretty" }
rustc_feature = { path = "../rustc_feature" }
rustc_trait_selection = { path = "../rustc_trait_selection" }

21
compiler/rustc_passes/messages.ftl
View File

@ -720,26 +720,7 @@ passes_ignored_derived_impls =
*[other] traits {$trait_list}, but these are
} intentionally ignored during dead code analysis
passes_proc_macro_typeerror = mismatched {$kind} signature
.label = found {$found}, expected type `proc_macro::TokenStream`
.note = {$kind}s must have a signature of `{$expected_signature}`
passes_proc_macro_diff_arg_count = mismatched {$kind} signature
.label = found unexpected {$count ->
[one] argument
*[other] arguments
}
.note = {$kind}s must have a signature of `{$expected_signature}`
passes_proc_macro_missing_args = mismatched {$kind} signature
.label = {$kind} must have {$expected_input_count ->
[one] one argument
*[other] two arguments
} of type `proc_macro::TokenStream`
passes_proc_macro_invalid_abi = proc macro functions may not be `extern "{$abi}"`
passes_proc_macro_unsafe = proc macro functions may not be `unsafe`
passes_proc_macro_bad_sig = {$kind} has incorrect signature
passes_skipping_const_checks = skipping const checks

142
compiler/rustc_passes/src/check_attr.rs
View File

@ -19,9 +19,10 @@
use rustc_hir::{MethodKind, Target, Unsafety};
use rustc_middle::hir::nested_filter;
use rustc_middle::middle::resolve_bound_vars::ObjectLifetimeDefault;
use rustc_middle::ty::fast_reject::{DeepRejectCtxt, TreatParams};
use rustc_middle::traits::ObligationCause;
use rustc_middle::ty::error::ExpectedFound;
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::{ParamEnv, TyCtxt};
use rustc_middle::ty::{self, TyCtxt};
use rustc_session::lint::builtin::{
CONFLICTING_REPR_HINTS, INVALID_DOC_ATTRIBUTES, INVALID_MACRO_EXPORT_ARGUMENTS,
UNUSED_ATTRIBUTES,
@ -30,6 +31,9 @@
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::{Span, DUMMY_SP};
use rustc_target::spec::abi::Abi;
use rustc_trait_selection::infer::{TyCtxtInferExt, ValuePairs};
use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
use rustc_trait_selection::traits::ObligationCtxt;
use std::cell::Cell;
use std::collections::hash_map::Entry;
@ -2188,101 +2192,67 @@ fn check_unused_attribute(&self, hir_id: HirId, attr: &Attribute) {
///
/// If this best effort goes wrong, it will just emit a worse error later (see #102923)
fn check_proc_macro(&self, hir_id: HirId, target: Target, kind: ProcMacroKind) {
let expected_input_count = match kind {
ProcMacroKind::Attribute => 2,
ProcMacroKind::Derive | ProcMacroKind::FunctionLike => 1,
};
let expected_signature = match kind {
ProcMacroKind::Attribute => "fn(TokenStream, TokenStream) -> TokenStream",
ProcMacroKind::Derive | ProcMacroKind::FunctionLike => "fn(TokenStream) -> TokenStream",
};
if target != Target::Fn {
return;
}
let tcx = self.tcx;
if target == Target::Fn {
let Some(tokenstream) = tcx.get_diagnostic_item(sym::TokenStream) else {return};
let tokenstream = tcx.type_of(tokenstream).subst_identity();
let Some(token_stream_def_id) = tcx.get_diagnostic_item(sym::TokenStream) else { return; };
let Some(token_stream) = tcx.type_of(token_stream_def_id).no_bound_vars() else { return; };
let id = hir_id.expect_owner();
let hir_sig = tcx.hir().fn_sig_by_hir_id(hir_id).unwrap();
let def_id = hir_id.expect_owner().def_id;
let param_env = ty::ParamEnv::empty();
let sig =
tcx.liberate_late_bound_regions(id.to_def_id(), tcx.fn_sig(id).subst_identity());
let sig = tcx.normalize_erasing_regions(ParamEnv::empty(), sig);
let infcx = tcx.infer_ctxt().build();
let ocx = ObligationCtxt::new(&infcx);
// We don't currently require that the function signature is equal to
// `fn(TokenStream) -> TokenStream`, but instead monomorphizes to
// `fn(TokenStream) -> TokenStream` after some substitution of generic arguments.
//
// Properly checking this means pulling in additional `rustc` crates, so we don't.
let drcx = DeepRejectCtxt { treat_obligation_params: TreatParams::AsCandidateKey };
let span = tcx.def_span(def_id);
let fresh_substs = infcx.fresh_substs_for_item(span, def_id.to_def_id());
let sig = tcx.liberate_late_bound_regions(
def_id.to_def_id(),
tcx.fn_sig(def_id).subst(tcx, fresh_substs),
);
if sig.abi != Abi::Rust {
tcx.sess.emit_err(errors::ProcMacroInvalidAbi {
span: hir_sig.span,
abi: sig.abi.name(),
});
let cause = ObligationCause::misc(span, def_id);
let sig = ocx.normalize(&cause, param_env, sig);
// proc macro is not WF.
let errors = ocx.select_where_possible();
if !errors.is_empty() {
return;
}
let expected_sig = tcx.mk_fn_sig(
std::iter::repeat(token_stream).take(match kind {
ProcMacroKind::Attribute => 2,
ProcMacroKind::Derive | ProcMacroKind::FunctionLike => 1,
}),
token_stream,
false,
Unsafety::Normal,
Abi::Rust,
);
if let Err(terr) = ocx.eq(&cause, param_env, expected_sig, sig) {
let mut diag = tcx.sess.create_err(errors::ProcMacroBadSig { span, kind });
infcx.err_ctxt().note_type_err(
&mut diag,
&cause,
None,
Some(ValuePairs::Sigs(ExpectedFound { expected: expected_sig, found: sig })),
terr,
false,
false,
);
diag.emit();
self.abort.set(true);
}
if sig.unsafety == Unsafety::Unsafe {
tcx.sess.emit_err(errors::ProcMacroUnsafe { span: hir_sig.span });
let errors = ocx.select_all_or_error();
if !errors.is_empty() {
infcx.err_ctxt().report_fulfillment_errors(&errors);
self.abort.set(true);
}
let output = sig.output();
// Typecheck the output
if !drcx.types_may_unify(output, tokenstream) {
tcx.sess.emit_err(errors::ProcMacroTypeError {
span: hir_sig.decl.output.span(),
found: output,
kind,
expected_signature,
});
self.abort.set(true);
}
if sig.inputs().len() < expected_input_count {
tcx.sess.emit_err(errors::ProcMacroMissingArguments {
expected_input_count,
span: hir_sig.span,
kind,
expected_signature,
});
self.abort.set(true);
}
// Check that the inputs are correct, if there are enough.
if sig.inputs().len() >= expected_input_count {
for (arg, input) in
sig.inputs().iter().zip(hir_sig.decl.inputs).take(expected_input_count)
{
if !drcx.types_may_unify(*arg, tokenstream) {
tcx.sess.emit_err(errors::ProcMacroTypeError {
span: input.span,
found: *arg,
kind,
expected_signature,
});
self.abort.set(true);
}
}
}
// Check that there are not too many arguments
let body_id = tcx.hir().body_owned_by(id.def_id);
let excess = tcx.hir().body(body_id).params.get(expected_input_count..);
if let Some(excess @ [begin @ end] | excess @ [begin, .., end]) = excess {
tcx.sess.emit_err(errors::ProcMacroDiffArguments {
span: begin.span.to(end.span),
count: excess.len(),
kind,
expected_signature,
});
self.abort.set(true);
}
}
}
}

45
compiler/rustc_passes/src/errors.rs
View File

@ -1546,52 +1546,11 @@ pub struct ChangeFieldsToBeOfUnitType {
}
#[derive(Diagnostic)]
#[diag(passes_proc_macro_typeerror)]
#[note]
pub(crate) struct ProcMacroTypeError<'tcx> {
#[diag(passes_proc_macro_bad_sig)]
pub(crate) struct ProcMacroBadSig {
#[primary_span]
#[label]
pub span: Span,
pub found: Ty<'tcx>,
pub kind: ProcMacroKind,
pub expected_signature: &'static str,
}
#[derive(Diagnostic)]
#[diag(passes_proc_macro_diff_arg_count)]
pub(crate) struct ProcMacroDiffArguments {
#[primary_span]
#[label]
pub span: Span,
pub count: usize,
pub kind: ProcMacroKind,
pub expected_signature: &'static str,
}
#[derive(Diagnostic)]
#[diag(passes_proc_macro_missing_args)]
pub(crate) struct ProcMacroMissingArguments {
#[primary_span]
#[label]
pub span: Span,
pub expected_input_count: usize,
pub kind: ProcMacroKind,
pub expected_signature: &'static str,
}
#[derive(Diagnostic)]
#[diag(passes_proc_macro_invalid_abi)]
pub(crate) struct ProcMacroInvalidAbi {
#[primary_span]
pub span: Span,
pub abi: &'static str,
}
#[derive(Diagnostic)]
#[diag(passes_proc_macro_unsafe)]
pub(crate) struct ProcMacroUnsafe {
#[primary_span]
pub span: Span,
}
#[derive(Diagnostic)]

15
tests/ui/proc-macro/bad-projection.rs Normal file
View File

@ -0,0 +1,15 @@
// force-host
// no-prefer-dynamic
#![crate_type = "proc-macro"]
#![allow(warnings)]
extern crate proc_macro;
trait Project {
type Assoc;
}
#[proc_macro]
pub fn uwu() -> <() as Project>::Assoc {}
//~^ ERROR the trait bound `(): Project` is not satisfied

9
tests/ui/proc-macro/bad-projection.stderr Normal file
View File

@ -0,0 +1,9 @@
error[E0277]: the trait bound `(): Project` is not satisfied
--> $DIR/bad-projection.rs:14:17
|
LL | pub fn uwu() -> <() as Project>::Assoc {}
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `Project` is not implemented for `()`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.

6
tests/ui/proc-macro/proc-macro-abi.rs
View File

@ -9,19 +9,19 @@
#[proc_macro]
pub extern "C" fn abi(a: TokenStream) -> TokenStream {
//~^ ERROR proc macro functions may not be `extern "C"`
//~^ ERROR function-like proc macro has incorrect signature
a
}
#[proc_macro]
pub extern "system" fn abi2(a: TokenStream) -> TokenStream {
//~^ ERROR proc macro functions may not be `extern "system"`
//~^ ERROR function-like proc macro has incorrect signature
a
}
#[proc_macro]
pub extern fn abi3(a: TokenStream) -> TokenStream {
//~^ ERROR proc macro functions may not be `extern "C"`
//~^ ERROR function-like proc macro has incorrect signature
a
}

21
tests/ui/proc-macro/proc-macro-abi.stderr
View File

@ -1,20 +1,29 @@
error: proc macro functions may not be `extern "C"`
error: function-like proc macro has incorrect signature
--> $DIR/proc-macro-abi.rs:11:1
|
LL | pub extern "C" fn abi(a: TokenStream) -> TokenStream {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected "Rust" fn, found "C" fn
|
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `extern "C" fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
error: proc macro functions may not be `extern "system"`
error: function-like proc macro has incorrect signature
--> $DIR/proc-macro-abi.rs:17:1
|
LL | pub extern "system" fn abi2(a: TokenStream) -> TokenStream {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected "Rust" fn, found "system" fn
|
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `extern "system" fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
error: proc macro functions may not be `extern "C"`
error: function-like proc macro has incorrect signature
--> $DIR/proc-macro-abi.rs:23:1
|
LL | pub extern fn abi3(a: TokenStream) -> TokenStream {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected "Rust" fn, found "C" fn
|
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `extern "C" fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
error: aborting due to 3 previous errors

10
tests/ui/proc-macro/signature-proc-macro-attribute.rs
View File

@ -8,25 +8,23 @@
#[proc_macro_attribute]
pub fn bad_input(input: String) -> TokenStream {
//~^ ERROR mismatched attribute proc macro signature
//~^ ERROR attribute proc macro has incorrect signature
::proc_macro::TokenStream::new()
}
#[proc_macro_attribute]
pub fn bad_output(input: TokenStream) -> String {
//~^ ERROR mismatched attribute proc macro signature
//~| ERROR mismatched attribute proc macro signature
//~^ ERROR attribute proc macro has incorrect signature
String::from("blah")
}
#[proc_macro_attribute]
pub fn bad_everything(input: String) -> String {
//~^ ERROR mismatched attribute proc macro signature
//~| ERROR mismatched attribute proc macro signature
//~^ ERROR attribute proc macro has incorrect signature
input
}
#[proc_macro_attribute]
pub fn too_many(a: TokenStream, b: TokenStream, c: String) -> TokenStream {
//~^ ERROR mismatched attribute proc macro signature
//~^ ERROR attribute proc macro has incorrect signature
}

46
tests/ui/proc-macro/signature-proc-macro-attribute.stderr
View File

@ -1,42 +1,38 @@
error: mismatched attribute proc macro signature
error: attribute proc macro has incorrect signature
--> $DIR/signature-proc-macro-attribute.rs:10:1
|
LL | pub fn bad_input(input: String) -> TokenStream {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ attribute proc macro must have two arguments of type `proc_macro::TokenStream`
error: mismatched attribute proc macro signature
--> $DIR/signature-proc-macro-attribute.rs:16:42
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
|
LL | pub fn bad_output(input: TokenStream) -> String {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
|
= note: attribute proc macros must have a signature of `fn(TokenStream, TokenStream) -> TokenStream`
= note: expected signature `fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(std::string::String) -> proc_macro::TokenStream`
error: mismatched attribute proc macro signature
error: attribute proc macro has incorrect signature
--> $DIR/signature-proc-macro-attribute.rs:16:1
|
LL | pub fn bad_output(input: TokenStream) -> String {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ attribute proc macro must have two arguments of type `proc_macro::TokenStream`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
|
= note: expected signature `fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(proc_macro::TokenStream) -> std::string::String`
error: mismatched attribute proc macro signature
--> $DIR/signature-proc-macro-attribute.rs:23:41
error: attribute proc macro has incorrect signature
--> $DIR/signature-proc-macro-attribute.rs:22:1
|
LL | pub fn bad_everything(input: String) -> String {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
|
= note: attribute proc macros must have a signature of `fn(TokenStream, TokenStream) -> TokenStream`
= note: expected signature `fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(std::string::String) -> std::string::String`
error: mismatched attribute proc macro signature
--> $DIR/signature-proc-macro-attribute.rs:23:1
|
LL | pub fn bad_everything(input: String) -> String {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ attribute proc macro must have two arguments of type `proc_macro::TokenStream`
error: mismatched attribute proc macro signature
--> $DIR/signature-proc-macro-attribute.rs:30:49
error: attribute proc macro has incorrect signature
--> $DIR/signature-proc-macro-attribute.rs:28:1
|
LL | pub fn too_many(a: TokenStream, b: TokenStream, c: String) -> TokenStream {
| ^^^^^^^^^ found unexpected argument
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
|
= note: expected signature `fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(proc_macro::TokenStream, proc_macro::TokenStream, std::string::String) -> proc_macro::TokenStream`
error: aborting due to 6 previous errors
error: aborting due to 4 previous errors

9
tests/ui/proc-macro/signature-proc-macro-derive.rs
View File

@ -8,24 +8,23 @@
#[proc_macro_derive(Blah)]
pub fn bad_input(input: String) -> TokenStream {
//~^ ERROR mismatched derive proc macro signature
//~^ ERROR derive proc macro has incorrect signature
TokenStream::new()
}
#[proc_macro_derive(Bleh)]
pub fn bad_output(input: TokenStream) -> String {
//~^ ERROR mismatched derive proc macro signature
//~^ ERROR derive proc macro has incorrect signature
String::from("blah")
}
#[proc_macro_derive(Bluh)]
pub fn bad_everything(input: String) -> String {
//~^ ERROR mismatched derive proc macro signature
//~| ERROR mismatched derive proc macro signature
//~^ ERROR derive proc macro has incorrect signature
input
}
#[proc_macro_derive(Blih)]
pub fn too_many(a: TokenStream, b: TokenStream, c: String) -> TokenStream {
//~^ ERROR mismatched derive proc macro signature
//~^ ERROR derive proc macro has incorrect signature
}

46
tests/ui/proc-macro/signature-proc-macro-derive.stderr
View File

@ -1,40 +1,38 @@
error: mismatched derive proc macro signature
--> $DIR/signature-proc-macro-derive.rs:10:25
error: derive proc macro has incorrect signature
--> $DIR/signature-proc-macro-derive.rs:10:1
|
LL | pub fn bad_input(input: String) -> TokenStream {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String`
|
= note: derive proc macros must have a signature of `fn(TokenStream) -> TokenStream`
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(std::string::String) -> proc_macro::TokenStream`
error: mismatched derive proc macro signature
--> $DIR/signature-proc-macro-derive.rs:16:42
error: derive proc macro has incorrect signature
--> $DIR/signature-proc-macro-derive.rs:16:1
|
LL | pub fn bad_output(input: TokenStream) -> String {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String`
|
= note: derive proc macros must have a signature of `fn(TokenStream) -> TokenStream`
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(proc_macro::TokenStream) -> std::string::String`
error: mismatched derive proc macro signature
--> $DIR/signature-proc-macro-derive.rs:22:41
error: derive proc macro has incorrect signature
--> $DIR/signature-proc-macro-derive.rs:22:1
|
LL | pub fn bad_everything(input: String) -> String {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String`
|
= note: derive proc macros must have a signature of `fn(TokenStream) -> TokenStream`
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(std::string::String) -> std::string::String`
error: mismatched derive proc macro signature
--> $DIR/signature-proc-macro-derive.rs:22:30
|
LL | pub fn bad_everything(input: String) -> String {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
|
= note: derive proc macros must have a signature of `fn(TokenStream) -> TokenStream`
error: mismatched derive proc macro signature
--> $DIR/signature-proc-macro-derive.rs:29:33
error: derive proc macro has incorrect signature
--> $DIR/signature-proc-macro-derive.rs:28:1
|
LL | pub fn too_many(a: TokenStream, b: TokenStream, c: String) -> TokenStream {
| ^^^^^^^^^^^^^^^^^^^^^^^^^ found unexpected arguments
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
|
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(proc_macro::TokenStream, proc_macro::TokenStream, std::string::String) -> proc_macro::TokenStream`
error: aborting due to 5 previous errors
error: aborting due to 4 previous errors

9
tests/ui/proc-macro/signature-proc-macro.rs
View File

@ -8,24 +8,23 @@
#[proc_macro]
pub fn bad_input(input: String) -> TokenStream {
//~^ ERROR mismatched function-like proc macro signature
//~^ ERROR function-like proc macro has incorrect signature
::proc_macro::TokenStream::new()
}
#[proc_macro]
pub fn bad_output(input: TokenStream) -> String {
//~^ ERROR mismatched function-like proc macro signature
//~^ ERROR function-like proc macro has incorrect signature
String::from("blah")
}
#[proc_macro]
pub fn bad_everything(input: String) -> String {
//~^ ERROR mismatched function-like proc macro signature
//~| ERROR mismatched function-like proc macro signature
//~^ ERROR function-like proc macro has incorrect signature
input
}
#[proc_macro]
pub fn too_many(a: TokenStream, b: TokenStream, c: String) -> TokenStream {
//~^ ERROR mismatched function-like proc macro signature
//~^ ERROR function-like proc macro has incorrect signature
}

46
tests/ui/proc-macro/signature-proc-macro.stderr
View File

@ -1,40 +1,38 @@
error: mismatched function-like proc macro signature
--> $DIR/signature-proc-macro.rs:10:25
error: function-like proc macro has incorrect signature
--> $DIR/signature-proc-macro.rs:10:1
|
LL | pub fn bad_input(input: String) -> TokenStream {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String`
|
= note: function-like proc macros must have a signature of `fn(TokenStream) -> TokenStream`
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(std::string::String) -> proc_macro::TokenStream`
error: mismatched function-like proc macro signature
--> $DIR/signature-proc-macro.rs:16:42
error: function-like proc macro has incorrect signature
--> $DIR/signature-proc-macro.rs:16:1
|
LL | pub fn bad_output(input: TokenStream) -> String {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String`
|
= note: function-like proc macros must have a signature of `fn(TokenStream) -> TokenStream`
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(proc_macro::TokenStream) -> std::string::String`
error: mismatched function-like proc macro signature
--> $DIR/signature-proc-macro.rs:22:41
error: function-like proc macro has incorrect signature
--> $DIR/signature-proc-macro.rs:22:1
|
LL | pub fn bad_everything(input: String) -> String {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `proc_macro::TokenStream`, found `std::string::String`
|
= note: function-like proc macros must have a signature of `fn(TokenStream) -> TokenStream`
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(std::string::String) -> std::string::String`
error: mismatched function-like proc macro signature
--> $DIR/signature-proc-macro.rs:22:30
|
LL | pub fn bad_everything(input: String) -> String {
| ^^^^^^ found std::string::String, expected type `proc_macro::TokenStream`
|
= note: function-like proc macros must have a signature of `fn(TokenStream) -> TokenStream`
error: mismatched function-like proc macro signature
--> $DIR/signature-proc-macro.rs:29:33
error: function-like proc macro has incorrect signature
--> $DIR/signature-proc-macro.rs:28:1
|
LL | pub fn too_many(a: TokenStream, b: TokenStream, c: String) -> TokenStream {
| ^^^^^^^^^^^^^^^^^^^^^^^^^ found unexpected arguments
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
|
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `fn(proc_macro::TokenStream, proc_macro::TokenStream, std::string::String) -> proc_macro::TokenStream`
error: aborting due to 5 previous errors
error: aborting due to 4 previous errors

6
tests/ui/proc-macro/signature.rs
View File

@ -8,10 +8,6 @@
#[proc_macro_derive(A)]
pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
//~^ ERROR: mismatched derive proc macro signature
//~| mismatched derive proc macro signature
//~| mismatched derive proc macro signature
//~| proc macro functions may not be `extern
//~| proc macro functions may not be `unsafe
//~^ ERROR: derive proc macro has incorrect signature
loop {}
}

35
tests/ui/proc-macro/signature.stderr
View File

@ -1,36 +1,11 @@
error: proc macro functions may not be `extern "C"`
error: derive proc macro has incorrect signature
--> $DIR/signature.rs:10:1
|
LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: proc macro functions may not be `unsafe`
--> $DIR/signature.rs:10:1
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected normal fn, found unsafe fn
|
LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: expected signature `fn(proc_macro::TokenStream) -> proc_macro::TokenStream`
found signature `unsafe extern "C" fn(i32, u32) -> u32`
error: mismatched derive proc macro signature
--> $DIR/signature.rs:10:49
|
LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
| ^^^ found u32, expected type `proc_macro::TokenStream`
|
= note: derive proc macros must have a signature of `fn(TokenStream) -> TokenStream`
error: mismatched derive proc macro signature
--> $DIR/signature.rs:10:33
|
LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
| ^^^ found i32, expected type `proc_macro::TokenStream`
|
= note: derive proc macros must have a signature of `fn(TokenStream) -> TokenStream`
error: mismatched derive proc macro signature
--> $DIR/signature.rs:10:38
|
LL | pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
| ^^^^^^ found unexpected argument
error: aborting due to 5 previous errors
error: aborting due to previous error