Move the E0130 check to AST validation pass

src/librustc_passes/ast_validation.rs

@@ -135,6 +135,23 @@ fn visit_item(&mut self, item: &Item) {
         visit::walk_item(self, item)
     }
 
+    fn visit_foreign_item(&mut self, fi: &ForeignItem) {
+        match fi.node {
+            ForeignItemKind::Fn(ref decl, _) => {
+                for arg in &decl.inputs {
+                    match arg.pat.node {
+                        PatKind::Ident(..) | PatKind::Wild => {}
+                        _ => span_err!(self.session, arg.pat.span, E0130,
+                                       "patterns aren't allowed in foreign function declarations")
+                    }
+                }
+            }
+            ForeignItemKind::Static(..) => {}
+        }
+
+        visit::walk_foreign_item(self, fi)
+    }
+
     fn visit_variant_data(&mut self, vdata: &VariantData, _: Ident,
                           _: &Generics, _: NodeId, span: Span) {
         if vdata.fields().is_empty() {

src/librustc_passes/diagnostics.rs

@@ -49,6 +49,39 @@
 ```
 "##,
 
+E0130: r##"
+You declared a pattern as an argument in a foreign function declaration.
+Erroneous code example:
+
+```compile_fail
+extern {
+    fn foo((a, b): (u32, u32)); // error: patterns aren't allowed in foreign
+                                //        function declarations
+}
+```
+
+Please replace the pattern argument with a regular one. Example:
+
+```
+struct SomeStruct {
+    a: u32,
+    b: u32,
+}
+
+extern {
+    fn foo(s: SomeStruct); // ok!
+}
+```
+
+Or:
+
+```
+extern {
+    fn foo(a: (u32, u32)); // ok!
+}
+```
+"##,
+
 E0161: r##"
 A value was moved. However, its size was not known at compile time, and only
 values of a known size can be moved.

src/librustc_typeck/collect.rs

@@ -60,8 +60,6 @@
 
 use astconv::{AstConv, ast_region_to_region, Bounds, PartitionedBounds, partition_bounds};
 use lint;
-use hir::def::Def;
-use hir::def_id::DefId;
 use constrained_type_params as ctp;
 use middle::lang_items::SizedTraitLangItem;
 use middle::const_val::ConstVal;
@@ -74,7 +72,6 @@
 use rustc::ty::util::IntTypeExt;
 use rscope::*;
 use rustc::dep_graph::DepNode;
-use rustc::hir::map as hir_map;
 use util::common::{ErrorReported, MemoizationMap};
 use util::nodemap::{NodeMap, FnvHashMap};
 use {CrateCtxt, write_ty_to_tcx};
@@ -91,9 +88,9 @@
 use syntax::ptr::P;
 use syntax_pos::Span;
 
-use rustc::hir::{self, PatKind};
-use rustc::hir::intravisit;
-use rustc::hir::print as pprust;
+use rustc::hir::{self, intravisit, map as hir_map, print as pprust};
+use rustc::hir::def::Def;
+use rustc::hir::def_id::DefId;
 
 ///////////////////////////////////////////////////////////////////////////
 // Main entry point
@@ -2144,14 +2141,6 @@ fn compute_type_scheme_of_foreign_fn_decl<'a, 'tcx>(
     abi: abi::Abi)
     -> ty::TypeScheme<'tcx>
 {
-    for i in &decl.inputs {
-        match i.pat.node {
-            PatKind::Binding(..) | PatKind::Wild => {}
-            _ => span_err!(ccx.tcx.sess, i.pat.span, E0130,
-                           "patterns aren't allowed in foreign function declarations")
-        }
-    }
-
     let ty_generics = ty_generics_for_fn(ccx, ast_generics, &ty::Generics::empty());
 
     let rb = BindingRscope::new();

src/librustc_typeck/diagnostics.rs

@@ -1800,39 +1800,6 @@ struct Foo<U=(), T=U> {
 parameter if so.
 "##,
 
-E0130: r##"
-You declared a pattern as an argument in a foreign function declaration.
-Erroneous code example:
-
-```compile_fail
-extern {
-    fn foo((a, b): (u32, u32)); // error: patterns aren't allowed in foreign
-                                //        function declarations
-}
-```
-
-Please replace the pattern argument with a regular one. Example:
-
-```
-struct SomeStruct {
-    a: u32,
-    b: u32,
-}
-
-extern {
-    fn foo(s: SomeStruct); // ok!
-}
-```
-
-Or:
-
-```
-extern {
-    fn foo(a: (u32, u32)); // ok!
-}
-```
-"##,
-
 E0131: r##"
 It is not possible to define `main` with type parameters, or even with function
 parameters. When `main` is present, it must take no arguments and return `()`.