Auto merge of #34637 - GuillaumeGomez:syntax_codes, r=jonathandturner

Syntax codes

r? @jonathandturner

cc @steveklabnik

This is a first big shot. I'll do the second one later in the week once this one is merged.

2 files changed, 143 insertions, 10 deletions

diff --git a/src/libsyntax/attr.rs b/src/libsyntax/attr.rs
index e01bd2a93aa..67f73d4dd4f 100644
--- a/src/libsyntax/attr.rs
+++ b/src/libsyntax/attr.rs
@@ -324,7 +324,7 @@ pub fn find_export_name_attr(diag: &Handler, attrs: &[Attribute]) -> Option<Inte
             if let s@Some(_) = attr.value_str() {
                 s
             } else {
-                struct_span_err!(diag, attr.span, E0533,
+                struct_span_err!(diag, attr.span, E0558,
                                  "export_name attribute has invalid format")
                                 .help("use #[export_name=\"*\"]")
                                 .emit();
@@ -373,7 +373,7 @@ pub fn find_inline_attr(diagnostic: Option<&Handler>, attrs: &[Attribute]) -> In
                     InlineAttr::None
                 }
             }
-            _ => ia
+            _ => ia,
         }
     })
 }
diff --git a/src/libsyntax/diagnostic_list.rs b/src/libsyntax/diagnostic_list.rs
index eb30657bd56..010b1d638e6 100644
--- a/src/libsyntax/diagnostic_list.rs
+++ b/src/libsyntax/diagnostic_list.rs
@@ -1,4 +1,4 @@
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -15,9 +15,146 @@
 // In vim you can `:set tw=80` and use `gq` to wrap paragraphs. Use `:set tw=0` to disable.
 register_long_diagnostics! {
 
-E0533: r##"
-```compile_fail,E0533
-#[export_name]
+E0534: r##"
+The `inline` attribute was malformed.
+
+Erroneous code example:
+
+```compile_fail,E0534
+#[inline()] // error: expected one argument
+pub fn something() {}
+
+fn main() {}
+```
+
+The parenthesized `inline` attribute requires the parameter to be specified:
+
+```ignore
+#[inline(always)]
+fn something() {}
+
+// or:
+
+#[inline(never)]
+fn something() {}
+```
+
+Alternatively, a paren-less version of the attribute may be used to hint the
+compiler about inlining opportunity:
+
+```
+#[inline]
+fn something() {}
+```
+
+For more information about the inline attribute, read:
+https://doc.rust-lang.org/reference.html#inline-attributes
+"##,
+
+E0535: r##"
+An unknown argument was given to the `inline` attribute.
+
+Erroneous code example:
+
+```compile_fail,E0535
+#[inline(unknown)] // error: invalid argument
+pub fn something() {}
+
+fn main() {}
+```
+
+The `inline` attribute only supports two arguments:
+
+ * always
+ * never
+
+All other arguments given to the `inline` attribute will return this error.
+Example:
+
+```
+#[inline(never)] // ok!
+pub fn something() {}
+
+fn main() {}
+```
+
+For more information about the inline attribute, https:
+read://doc.rust-lang.org/reference.html#inline-attributes
+"##,
+
+E0536: r##"
+The `not` cfg-predicate was malformed.
+
+Erroneous code example:
+
+```compile_fail,E0536
+#[cfg(not())] // error: expected 1 cfg-pattern
+pub fn something() {}
+
+pub fn main() {}
+```
+
+The `not` predicate expects one cfg-pattern. Example:
+
+```
+#[cfg(not(target_os = "linux"))] // ok!
+pub fn something() {}
+
+pub fn main() {}
+```
+
+For more information about the cfg attribute, read:
+https://doc.rust-lang.org/reference.html#conditional-compilation
+"##,
+
+E0537: r##"
+An unknown predicate was used inside the `cfg` attribute.
+
+Erroneous code example:
+
+```compile_fail,E0537
+#[cfg(unknown())] // error: invalid predicate `unknown`
+pub fn something() {}
+
+pub fn main() {}
+```
+
+The `cfg` attribute supports only three kinds of predicates:
+
+ * any
+ * all
+ * not
+
+Example:
+
+```
+#[cfg(not(target_os = "linux"))] // ok!
+pub fn something() {}
+
+pub fn main() {}
+```
+
+For more information about the cfg attribute, read:
+https://doc.rust-lang.org/reference.html#conditional-compilation
+"##,
+
+E0558: r##"
+The `export_name` attribute was malformed.
+
+Erroneous code example:
+
+```compile_fail,E0558
+#[export_name] // error: export_name attribute has invalid format
+pub fn something() {}
+
+fn main() {}
+```
+
+The `export_name` attribute expects a string in order to determine the name of
+the exported symbol. Example:
+
+```
+#[export_name = "some_function"] // ok!
 pub fn something() {}
 
 fn main() {}
@@ -27,10 +164,6 @@ fn main() {}
 }
 
 register_diagnostics! {
-    E0534, // expected one argument
-    E0535, // invalid argument
-    E0536, // expected 1 cfg-pattern
-    E0537, // invalid predicate
     E0538, // multiple [same] items
     E0539, // incorrect meta item
     E0540, // multiple rustc_deprecated attributes