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Prevent main and start from having a where clause.
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27acb9b3c0
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@ -4519,6 +4519,32 @@ impl Foo for () {
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```
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"##,
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E0646: r##"
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It is not possible to define `main` with a where clause.
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Erroneous code example:
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```compile_fail,E0646
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fn main() where i32: Copy { // error: main function is not allowed to have
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// a where clause
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}
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```
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"##,
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E0647: r##"
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It is not possible to define `start` with a where clause.
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Erroneous code example:
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```compile_fail,E0647
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#![feature(start)]
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#[start]
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fn start(_: isize, _: *const *const u8) -> isize where (): Copy {
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//^ error: start function is not allowed to have a where clause
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0
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}
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```
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"##,
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E0689: r##"
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This error indicates that the numeric value for the method being passed exists
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but the type of the numeric value or binding could not be identified.
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@ -196,6 +196,12 @@ fn check_main_fn_ty<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
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.emit();
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return;
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}
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if !generics.where_clause.predicates.is_empty() {
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struct_span_err!(tcx.sess, main_span, E0646,
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"main function is not allowed to have a where clause")
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.emit();
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return;
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}
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}
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_ => ()
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}
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@ -247,14 +253,21 @@ fn check_start_fn_ty<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
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match tcx.hir.find(start_id) {
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Some(hir_map::NodeItem(it)) => {
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match it.node {
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hir::ItemFn(..,ref ps,_)
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if !ps.params.is_empty() => {
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struct_span_err!(tcx.sess, ps.span, E0132,
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"start function is not allowed to have type parameters")
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.span_label(ps.span,
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"start function cannot have type parameters")
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.emit();
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return;
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hir::ItemFn(..,ref ps,_) => {
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if !ps.params.is_empty() {
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struct_span_err!(tcx.sess, ps.span, E0132,
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"start function is not allowed to have type parameters")
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.span_label(ps.span,
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"start function cannot have type parameters")
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.emit();
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return;
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}
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if !ps.where_clause.predicates.is_empty() {
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struct_span_err!(tcx.sess, start_span, E0647,
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"start function is not allowed to have a where clause")
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.emit();
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return;
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}
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}
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_ => ()
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}
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11
src/test/ui/error-codes/E0646.rs
Normal file
11
src/test/ui/error-codes/E0646.rs
Normal file
@ -0,0 +1,11 @@
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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fn main() where (): Copy {} //~ ERROR [E0646]
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9
src/test/ui/error-codes/E0646.stderr
Normal file
9
src/test/ui/error-codes/E0646.stderr
Normal file
@ -0,0 +1,9 @@
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error[E0646]: main function is not allowed to have a where clause
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--> $DIR/E0646.rs:11:1
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LL | fn main() where (): Copy {} //~ ERROR [E0646]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0646`.
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19
src/test/ui/error-codes/E0647.rs
Normal file
19
src/test/ui/error-codes/E0647.rs
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@ -0,0 +1,19 @@
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![no_std]
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#![feature(start)]
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extern crate std;
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#[start]
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fn start(_: isize, _: *const *const u8) -> isize where (): Copy { //~ ERROR [E0647]
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0
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}
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src/test/ui/error-codes/E0647.stderr
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11
src/test/ui/error-codes/E0647.stderr
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@ -0,0 +1,11 @@
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error[E0647]: start function is not allowed to have a where clause
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--> $DIR/E0647.rs:17:1
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LL | / fn start(_: isize, _: *const *const u8) -> isize where (): Copy { //~ ERROR [E0647]
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LL | | 0
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LL | | }
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| |_^
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0647`.
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22
src/test/ui/issue-50714-1.rs
Normal file
22
src/test/ui/issue-50714-1.rs
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@ -0,0 +1,22 @@
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Regression test for issue 50714, make sure that this isn't a linker error.
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#![no_std]
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#![feature(start)]
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extern crate std;
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#[start]
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fn start(_: isize, _: *const *const u8) -> isize where fn(&()): Eq { //~ ERROR [E0647]
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0
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}
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11
src/test/ui/issue-50714-1.stderr
Normal file
11
src/test/ui/issue-50714-1.stderr
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@ -0,0 +1,11 @@
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error[E0647]: start function is not allowed to have a where clause
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--> $DIR/issue-50714-1.rs:19:1
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LL | / fn start(_: isize, _: *const *const u8) -> isize where fn(&()): Eq { //~ ERROR [E0647]
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LL | | 0
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LL | | }
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| |_^
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0647`.
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14
src/test/ui/issue-50714.rs
Normal file
14
src/test/ui/issue-50714.rs
Normal file
@ -0,0 +1,14 @@
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Regression test for issue 50714, make sure that this isn't a linker error.
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fn main() where fn(&()): Eq {} //~ ERROR [E0646]
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9
src/test/ui/issue-50714.stderr
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9
src/test/ui/issue-50714.stderr
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@ -0,0 +1,9 @@
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error[E0646]: main function is not allowed to have a where clause
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--> $DIR/issue-50714.rs:13:1
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LL | fn main() where fn(&()): Eq {} //~ ERROR [E0646]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0646`.
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