resolve: Reserve a few very special names in macro namespace
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65c8c97bc7
commit
de153d61f5
7 changed files with 62 additions and 52 deletions
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@ -1083,6 +1083,9 @@ impl<'a, 'cl> Resolver<'a, 'cl> {
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self.define(module, ident, MacroNS,
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(def, vis, item.span, expansion, IsMacroExport));
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} else {
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if !attr::contains_name(&item.attrs, "rustc_doc_only_macro") {
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self.check_reserved_macro_name(ident, MacroNS);
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}
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self.unused_macros.insert(def_id);
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}
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} else {
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@ -452,6 +452,16 @@ impl<'a, 'crateloader> Resolver<'a, 'crateloader> {
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})
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}
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crate fn check_reserved_macro_name(&self, ident: Ident, ns: Namespace) {
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// Reserve some names that are not quite covered by the general check
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// performed on `Resolver::builtin_attrs`.
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if ns == MacroNS &&
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(ident.name == "cfg" || ident.name == "cfg_attr" || ident.name == "derive") {
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self.session.span_err(ident.span,
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&format!("name `{}` is reserved in macro namespace", ident));
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}
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}
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// Define the name or return the existing binding if there is a collision.
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pub fn try_define(&mut self,
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module: Module<'a>,
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@ -459,6 +469,7 @@ impl<'a, 'crateloader> Resolver<'a, 'crateloader> {
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ns: Namespace,
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binding: &'a NameBinding<'a>)
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-> Result<(), &'a NameBinding<'a>> {
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self.check_reserved_macro_name(ident, ns);
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self.update_resolution(module, ident, ns, |this, resolution| {
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if let Some(old_binding) = resolution.binding {
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if binding.is_glob_import() {
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@ -11,19 +11,6 @@ struct S;
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#[cfg_attr(all(), repr(C))] //~ ERROR `repr` is ambiguous
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struct SCond;
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#[cfg(all())] //~ ERROR `cfg` is ambiguous
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struct A;
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#[cfg(any())] // ERROR FIXME
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struct A;
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#[cfg_attr(all(), cold)] // ERROR FIXME
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fn g() {}
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#[cfg_attr(any(), cold)] // ERROR FIXME
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fn h() {}
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#[derive(Clone)] // ERROR FIXME
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struct B;
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#[test] // OK, shadowed
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fn test() {}
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@ -34,26 +34,8 @@ LL | #[cfg_attr(all(), repr(C))] //~ ERROR `repr` is ambiguous
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| ^^^^
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= note: consider adding an explicit import of `repr` to disambiguate
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error[E0659]: `cfg` is ambiguous
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--> $DIR/ambiguous-builtin-attrs.rs:14:3
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LL | #[cfg(all())] //~ ERROR `cfg` is ambiguous
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| ^^^ ambiguous name
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note: `cfg` could refer to the name imported here
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--> $DIR/ambiguous-builtin-attrs.rs:7:5
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LL | use builtin_attrs::*;
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| ^^^^^^^^^^^^^^^^
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note: `cfg` could also refer to the name defined here
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--> $DIR/ambiguous-builtin-attrs.rs:14:3
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LL | #[cfg(all())] //~ ERROR `cfg` is ambiguous
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| ^^^
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= note: consider adding an explicit import of `cfg` to disambiguate
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error[E0659]: `repr` is ambiguous
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--> $DIR/ambiguous-builtin-attrs.rs:33:34
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--> $DIR/ambiguous-builtin-attrs.rs:20:34
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LL | fn non_macro_expanded_location<#[repr(C)] T>() { //~ ERROR `repr` is ambiguous
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| ^^^^ ambiguous name
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@ -64,14 +46,14 @@ note: `repr` could refer to the name imported here
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LL | use builtin_attrs::*;
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| ^^^^^^^^^^^^^^^^
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note: `repr` could also refer to the name defined here
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--> $DIR/ambiguous-builtin-attrs.rs:33:34
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--> $DIR/ambiguous-builtin-attrs.rs:20:34
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LL | fn non_macro_expanded_location<#[repr(C)] T>() { //~ ERROR `repr` is ambiguous
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| ^^^^
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= note: consider adding an explicit import of `repr` to disambiguate
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error[E0659]: `repr` is ambiguous
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--> $DIR/ambiguous-builtin-attrs.rs:35:11
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--> $DIR/ambiguous-builtin-attrs.rs:22:11
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LL | #[repr(C)] //~ ERROR `repr` is ambiguous
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| ^^^^ ambiguous name
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@ -82,7 +64,7 @@ note: `repr` could refer to the name imported here
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LL | use builtin_attrs::*;
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| ^^^^^^^^^^^^^^^^
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note: `repr` could also refer to the name defined here
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--> $DIR/ambiguous-builtin-attrs.rs:35:11
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--> $DIR/ambiguous-builtin-attrs.rs:22:11
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LL | #[repr(C)] //~ ERROR `repr` is ambiguous
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| ^^^^
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@ -107,12 +89,12 @@ LL | #![feature(decl_macro)] //~ ERROR `feature` is ambiguous
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= note: consider adding an explicit import of `feature` to disambiguate
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error[E0425]: cannot find value `NonExistent` in this scope
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--> $DIR/ambiguous-builtin-attrs.rs:43:5
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--> $DIR/ambiguous-builtin-attrs.rs:30:5
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LL | NonExistent; //~ ERROR cannot find value `NonExistent` in this scope
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| ^^^^^^^^^^^ not found in this scope
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error: aborting due to 7 previous errors
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error: aborting due to 6 previous errors
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Some errors occurred: E0425, E0659.
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For more information about an error, try `rustc --explain E0425`.
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@ -25,21 +25,6 @@ pub fn repr(_: TokenStream, input: TokenStream) -> TokenStream {
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input
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}
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#[proc_macro_attribute]
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pub fn cfg(_: TokenStream, input: TokenStream) -> TokenStream {
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input
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}
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#[proc_macro_attribute]
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pub fn cfg_attr(_: TokenStream, input: TokenStream) -> TokenStream {
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input
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}
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#[proc_macro_attribute]
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pub fn derive(_: TokenStream, input: TokenStream) -> TokenStream {
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input
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}
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#[proc_macro_attribute]
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pub fn test(_: TokenStream, input: TokenStream) -> TokenStream {
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"struct Test;".parse().unwrap()
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22
src/test/ui-fulldeps/proc-macro/reserved-macro-names.rs
Normal file
22
src/test/ui-fulldeps/proc-macro/reserved-macro-names.rs
Normal file
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@ -0,0 +1,22 @@
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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::*;
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#[proc_macro_attribute]
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pub fn cfg(_: TokenStream, input: TokenStream) -> TokenStream {
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//~^ ERROR name `cfg` is reserved in macro namespace
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input
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}
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#[proc_macro_attribute]
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pub fn cfg_attr(_: TokenStream, input: TokenStream) -> TokenStream {
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//~^ ERROR name `cfg_attr` is reserved in macro namespace
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input
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}
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#[proc_macro_attribute]
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pub fn derive(_: TokenStream, input: TokenStream) -> TokenStream {
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//~^ ERROR name `derive` is reserved in macro namespace
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input
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}
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20
src/test/ui-fulldeps/proc-macro/reserved-macro-names.stderr
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20
src/test/ui-fulldeps/proc-macro/reserved-macro-names.stderr
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@ -0,0 +1,20 @@
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error: name `cfg` is reserved in macro namespace
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--> $DIR/reserved-macro-names.rs:7:8
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LL | pub fn cfg(_: TokenStream, input: TokenStream) -> TokenStream {
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| ^^^
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error: name `cfg_attr` is reserved in macro namespace
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--> $DIR/reserved-macro-names.rs:13:8
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LL | pub fn cfg_attr(_: TokenStream, input: TokenStream) -> TokenStream {
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| ^^^^^^^^
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error: name `derive` is reserved in macro namespace
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--> $DIR/reserved-macro-names.rs:19:8
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LL | pub fn derive(_: TokenStream, input: TokenStream) -> TokenStream {
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| ^^^^^^
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error: aborting due to 3 previous errors
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