track_caller error numbers and text.

src/librustc/error_codes.rs

@@ -1727,16 +1727,6 @@ each method; it is not possible to annotate the entire impl with an `#[inline]`
 attribute.
 "##,
 
-E0900: r##"
-FIXME(anp): change error number
-FIXME(anp): track_caller: invalid syntax
-"##,
-
-E0901: r##"
-FIXME(anp): change error number
-FIXME(anp): track_caller: no naked functions
-"##,
-
 E0522: r##"
 The lang attribute is intended for marking special items that are built-in to
 Rust itself. This includes special traits (like `Copy` and `Sized`) that affect
@@ -2244,6 +2234,15 @@ These attributes are meant to only be used by the standard library and are
 rejected in your own crates.
 "##,
 
+E0736: r##"
+#[track_caller] and #[naked] cannot be applied to the same function.
+
+This is primarily due to ABI incompatibilities between the two attributes.
+See [RFC 2091] for details on this and other limitations.
+
+[RFC 2091]: https://github.com/rust-lang/rfcs/blob/master/text/2091-inline-semantic.md
+"##,
+
 ;
 //  E0006, // merged with E0005
 //  E0101, // replaced with E0282
@@ -2306,4 +2305,5 @@ rejected in your own crates.
     E0726, // non-explicit (not `'_`) elided lifetime in unsupported position
     E0727, // `async` generators are not yet supported
     E0728, // `await` must be in an `async` function or block
+    E0735, // invalid track_caller application/syntax
 }

src/librustc/hir/check_attr.rs

@@ -143,7 +143,7 @@ impl CheckAttrVisitor<'tcx> {
             struct_span_err!(
                 self.tcx.sess,
                 attr.span,
-                E0900,
+                E0735,
                 "attribute should be applied to function"
             )
             .span_label(item.span, "not a function")
@@ -153,7 +153,7 @@ impl CheckAttrVisitor<'tcx> {
             struct_span_err!(
                 self.tcx.sess,
                 attr.span,
-                E0901,
+                E0736,
                 "cannot use `#[track_caller]` with `#[naked]`",
             )
             .emit();

src/librustc_typeck/check/wfcheck.rs

@@ -179,7 +179,7 @@ pub fn check_trait_item(tcx: TyCtxt<'_>, def_id: DefId) {
             struct_span_err!(
                 tcx.sess,
                 attr.span,
-                E0903,
+                E0738,
                 "`#[track_caller]` is not supported for trait items yet."
             ).emit();
         }

src/librustc_typeck/collect.rs

@@ -2601,7 +2601,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
                 struct_span_err!(
                     tcx.sess,
                     attr.span,
-                    E0902,
+                    E0737,
                     "rust ABI is required to use `#[track_caller]`"
                 ).emit();
             }

src/librustc_typeck/error_codes.rs

@@ -4908,14 +4908,18 @@ The `Box<...>` ensures that the result is of known size,
 and the pin is required to keep it in the same place in memory.
 "##,
 
-E0902: r##"
-FIXME(anp): change error number
-FIXME(anp): track_caller: require Rust ABI to use track_caller
+E0737: r##"
+#[track_caller] requires functions to have the "Rust" ABI for passing caller
+location. See [RFC 2091] for details on this and other restrictions.
+
+[RFC 2091]: https://github.com/rust-lang/rfcs/blob/master/text/2091-inline-semantic.md
 "##,
 
-E0903: r##"
-FIXME(anp): change error number
-FIXME(anp): track_caller: can't apply in traits
+E0738: r##"
+#[track_caller] cannot be applied to trait methods. See [RFC 2091]
+for details on this and other restrictions.
+
+[RFC 2091]: https://github.com/rust-lang/rfcs/blob/master/text/2091-inline-semantic.md
 "##,
 
 ;

src/test/ui/rfc-2091-track-caller/error-with-invalid-abi.stderr

@@ -1,9 +1,9 @@
-error[E0902]: rust ABI is required to use `#[track_caller]`
+error[E0737]: rust ABI is required to use `#[track_caller]`
   --> $DIR/error-with-invalid-abi.rs:3:1
    |
 LL | #[track_caller]
    | ^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0902`.
+For more information about this error, try `rustc --explain E0737`.

src/test/ui/rfc-2091-track-caller/error-with-naked.stderr

@@ -1,9 +1,9 @@
-error[E0901]: cannot use `#[track_caller]` with `#[naked]`
+error[E0736]: cannot use `#[track_caller]` with `#[naked]`
   --> $DIR/error-with-naked.rs:3:1
    |
 LL | #[track_caller]
    | ^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0901`.
+For more information about this error, try `rustc --explain E0736`.

src/test/ui/rfc-2091-track-caller/error-with-trait-fns.stderr

@@ -1,9 +1,9 @@
-error[E0903]: `#[track_caller]` is not supported for trait items yet.
+error[E0738]: `#[track_caller]` is not supported for trait items yet.
   --> $DIR/error-with-trait-fns.rs:4:5
    |
 LL |     #[track_caller]
    |     ^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0903`.
+For more information about this error, try `rustc --explain E0738`.

src/test/ui/rfc-2091-track-caller/only-for-fns.stderr

@@ -1,4 +1,4 @@
-error[E0900]: attribute should be applied to function
+error[E0735]: attribute should be applied to function
   --> $DIR/only-for-fns.rs:3:1
    |
 LL | #[track_caller]
@@ -8,4 +8,4 @@ LL | struct S;
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0900`.
+For more information about this error, try `rustc --explain E0735`.