11 files changed, 168 insertions, 13 deletions

diff --git a/src/ast/pattern.cpp b/src/ast/pattern.cpp
index ca5378e1..9e17abcf 100644
--- a/src/ast/pattern.cpp
+++ b/src/ast/pattern.cpp
@@ -70,6 +70,9 @@ namespace AST {
     (Tuple,
         os << "(" << ent.sub_patterns << ")";
         ),
+    (WildcardStructTuple,
+        os << ent.path << " (..)";
+        ),
     (StructTuple,
         os << ent.path << " (" << ent.sub_patterns << ")";
         ),
@@ -220,6 +223,9 @@ AST::Pattern AST::Pattern::clone() const
     (Tuple,
         rv.m_data = Data::make_Tuple({ H::clone_list(e.sub_patterns) });
         ),
+    (WildcardStructTuple,
+        rv.m_data = Data::make_WildcardStructTuple({ ::AST::Path(e.path) });
+        ),
     (StructTuple,
         rv.m_data = Data::make_StructTuple({ ::AST::Path(e.path), H::clone_list(e.sub_patterns) });
         ),
@@ -263,6 +269,9 @@ SERIALISE_TYPE(Pattern::, "Pattern", {
     (Tuple,
         s << e.sub_patterns;
         ),
+    (WildcardStructTuple,
+        s << e.path;
+        ),
     (StructTuple,
         s << e.path;
         s << e.sub_patterns;
@@ -304,6 +313,9 @@ SERIALISE_TYPE(Pattern::, "Pattern", {
     _D(Tuple,
         s.item( ent.sub_patterns );
         )
+    _D(WildcardStructTuple,
+        s.item( ent.path );
+        )
     _D(StructTuple,
         s.item( ent.path );
         s.item( ent.sub_patterns );
diff --git a/src/ast/pattern.hpp b/src/ast/pattern.hpp
index 79d349c2..699ed466 100644
--- a/src/ast/pattern.hpp
+++ b/src/ast/pattern.hpp
@@ -40,8 +40,9 @@ public:
         (Ref,       struct { bool mut; unique_ptr<Pattern> sub; } ),
         (Value,     struct { Value start; Value end; } ),
         (Tuple,     struct { ::std::vector<Pattern> sub_patterns; } ),
+        (WildcardStructTuple, struct { Path path;  } ),
         (StructTuple, struct { Path path; ::std::vector<Pattern> sub_patterns; } ),
-        (Struct,    struct { Path path; ::std::vector< ::std::pair< ::std::string, Pattern> > sub_patterns; } ),
+        (Struct,    struct { Path path; ::std::vector< ::std::pair< ::std::string, Pattern> > sub_patterns; bool is_exhaustive; } ),
         (Slice,     struct { ::std::vector<Pattern> leading; ::std::string extra_bind; ::std::vector<Pattern> trailing; } )
         );
 private:
@@ -110,13 +111,16 @@ public:
     {}
 
     struct TagEnumVariant {};
+    Pattern(TagEnumVariant, Path path):
+        m_data( Data::make_WildcardStructTuple( { ::std::move(path) } ) ) 
+    {}
     Pattern(TagEnumVariant, Path path, ::std::vector<Pattern> sub_patterns):
         m_data( Data::make_StructTuple( { ::std::move(path), ::std::move(sub_patterns) } ) ) 
     {}
 
     struct TagStruct {};
-    Pattern(TagStruct, Path path, ::std::vector< ::std::pair< ::std::string,Pattern> > sub_patterns):
-        m_data( Data::make_Struct( { ::std::move(path), ::std::move(sub_patterns) } ) ) 
+    Pattern(TagStruct, Path path, ::std::vector< ::std::pair< ::std::string,Pattern> > sub_patterns, bool is_exhaustive):
+        m_data( Data::make_Struct( { ::std::move(path), ::std::move(sub_patterns), is_exhaustive } ) ) 
     {}
 
     struct TagSlice {};
diff --git a/src/dump_as_rust.cpp b/src/dump_as_rust.cpp
index 4091842a..2d079223 100644
--- a/src/dump_as_rust.cpp
+++ b/src/dump_as_rust.cpp
@@ -808,15 +808,17 @@ void RustPrinter::print_pattern(const AST::Pattern& p, bool is_refutable)
             m_os << " ... " << v.end;
         }
         ),
-    (StructTuple, {
-        const auto& v = p.data().as_StructTuple();
+    (WildcardStructTuple,
+        m_os << v.path << "(..)";
+        ),
+    (StructTuple,
         m_os << v.path << "(";
         for(const auto& sp : v.sub_patterns) {
             print_pattern(sp, is_refutable);
             m_os << ",";
         }
         m_os << ")";
-        }),
+        ),
     (Struct, {
         const auto& v = p.data().as_Struct();
         m_os << v.path << "(";
diff --git a/src/expand/mod.cpp b/src/expand/mod.cpp
index c46c7d84..62425f86 100644
--- a/src/expand/mod.cpp
+++ b/src/expand/mod.cpp
@@ -161,6 +161,8 @@ void Expand_Pattern(bool is_early, ::AST::Crate& crate, LList<const AST::Module*
         for(auto& sp : e.sub_patterns)
             Expand_Pattern(is_early, crate, modstack, mod, sp);
         ),
+    (WildcardStructTuple,
+        ),
     (StructTuple,
         for(auto& sp : e.sub_patterns)
             Expand_Pattern(is_early, crate, modstack, mod, sp);
diff --git a/src/hir/from_ast.cpp b/src/hir/from_ast.cpp
index a3584663..8681a078 100644
--- a/src/hir/from_ast.cpp
+++ b/src/hir/from_ast.cpp
@@ -88,6 +88,8 @@
 
 ::HIR::Pattern LowerHIR_Pattern(const ::AST::Pattern& pat)
 {
+    TRACE_FUNCTION_F("@" << pat.span().filename << ":" << pat.span().start_line << " pat = " << pat);
+    
     ::HIR::PatternBinding   binding;
     if( pat.binding() != "" )
     {
@@ -144,6 +146,31 @@
             };
         ),
     
+    (WildcardStructTuple,
+        TU_MATCH_DEF(::AST::PathBinding, (e.path.binding()), (pb),
+        (
+            BUG(pat.span(), "Encountered StructTuple pattern not pointing to a enum variant or a struct - " << e.path);
+            ),
+        (EnumVar,
+            return ::HIR::Pattern {
+                mv$(binding),
+                ::HIR::Pattern::Data::make_EnumTupleWildcard({
+                    LowerHIR_GenericPath(pat.span(), e.path),
+                    nullptr, 0
+                    })
+                };
+            ),
+        (Struct,
+            return ::HIR::Pattern {
+                mv$(binding),
+                ::HIR::Pattern::Data::make_StructTupleWildcard({
+                    LowerHIR_GenericPath(pat.span(), e.path),
+                    nullptr
+                    })
+                };
+            )
+        )
+        ),
     (StructTuple,
         ::std::vector< ::HIR::Pattern>  sub_patterns;
         for(const auto& sp : e.sub_patterns)
@@ -191,7 +218,8 @@
                 ::HIR::Pattern::Data::make_EnumStruct({
                     LowerHIR_GenericPath(pat.span(), e.path),
                     nullptr, 0,
-                    mv$(sub_patterns)
+                    mv$(sub_patterns),
+                    e.is_exhaustive
                     })
                 };
             ),
@@ -201,7 +229,8 @@
                 ::HIR::Pattern::Data::make_Struct({
                     LowerHIR_GenericPath(pat.span(), e.path),
                     nullptr,
-                    mv$(sub_patterns)
+                    mv$(sub_patterns),
+                    e.is_exhaustive
                     })
                 };
             )
diff --git a/src/hir/pattern.hpp b/src/hir/pattern.hpp
index fc763f54..c7b0fe7d 100644
--- a/src/hir/pattern.hpp
+++ b/src/hir/pattern.hpp
@@ -65,10 +65,15 @@ struct Pattern
             const Struct*   binding;
             ::std::vector<Pattern> sub_patterns;
             } ),
+        (StructTupleWildcard, struct {
+            GenericPath path;
+            const Struct*   binding;
+            }),
         (Struct,    struct {
             GenericPath path;
             const Struct*   binding;
             ::std::vector< ::std::pair< ::std::string, Pattern> > sub_patterns;
+            bool is_exhaustive;
             } ),
         // Refutable
         (Value,     struct { Value val; } ),
@@ -79,11 +84,17 @@ struct Pattern
             unsigned binding_idx;
             ::std::vector<Pattern> sub_patterns;
             } ),
+        (EnumTupleWildcard, struct {
+            GenericPath path;
+            const Enum* binding_ptr;
+            unsigned binding_idx;
+            } ),
         (EnumStruct, struct {
             GenericPath path;
             const Enum* binding_ptr;
             unsigned binding_idx;
             ::std::vector< ::std::pair< ::std::string, Pattern> > sub_patterns;
+            bool is_exhaustive;
             } ),
         (Slice,     struct {
             ::std::vector<Pattern> sub_patterns;
diff --git a/src/hir/visitor.cpp b/src/hir/visitor.cpp
index 33ac6505..23acf4e4 100644
--- a/src/hir/visitor.cpp
+++ b/src/hir/visitor.cpp
@@ -300,6 +300,9 @@ void ::HIR::Visitor::visit_pattern(::HIR::Pattern& pat)
         for(auto& sp : e.sub_patterns)
             this->visit_pattern(sp);
         ),
+    (StructTupleWildcard,
+        this->visit_generic_path(e.path, ::HIR::Visitor::PathContext::TYPE);
+        ),
     (StructTuple,
         this->visit_generic_path(e.path, ::HIR::Visitor::PathContext::TYPE);
         for(auto& sp : e.sub_patterns)
@@ -318,6 +321,9 @@ void ::HIR::Visitor::visit_pattern(::HIR::Pattern& pat)
         this->visit_pattern_val(e.start);
         this->visit_pattern_val(e.end);
         ),
+    (EnumTupleWildcard,
+        this->visit_generic_path(e.path, ::HIR::Visitor::PathContext::TYPE);
+        ),
     (EnumTuple,
         this->visit_generic_path(e.path, ::HIR::Visitor::PathContext::TYPE);
         for(auto& sp : e.sub_patterns)
diff --git a/src/hir_conv/bind.cpp b/src/hir_conv/bind.cpp
index 948a3d75..97f52cc9 100644
--- a/src/hir_conv/bind.cpp
+++ b/src/hir_conv/bind.cpp
@@ -125,6 +125,18 @@ namespace {
                 fix_type_params(sp, str.m_params,  e.path.m_params);
                 e.binding = &str;
                 ),
+            (StructTupleWildcard,
+                const auto& str = *reinterpret_cast< const ::HIR::Struct*>( get_type_pointer(sp, m_crate, e.path.m_path, Target::Struct) );
+                TU_IFLET(::HIR::Struct::Data, str.m_data, Tuple, _,
+                    // All good
+                )
+                else {
+                    ERROR(sp, E0000, "Struct tuple pattern on non-tuple struct " << e.path);
+                }
+                
+                fix_type_params(sp, str.m_params,  e.path.m_params);
+                e.binding = &str;
+                ),
             (Struct,
                 const auto& str = *reinterpret_cast< const ::HIR::Struct*>( get_type_pointer(sp, m_crate, e.path.m_path, Target::Struct) );
                 TU_IFLET(::HIR::Struct::Data, str.m_data, Named, _,
@@ -154,6 +166,24 @@ namespace {
                 e.binding_ptr = &enm;
                 e.binding_idx = idx;
                 ),
+            (EnumTupleWildcard,
+                const auto& enm = *reinterpret_cast< const ::HIR::Enum*>( get_type_pointer(sp, m_crate, e.path.m_path, Target::EnumVariant) );
+                const auto& des_name = e.path.m_path.m_components.back();
+                unsigned int idx = ::std::find_if( enm.m_variants.begin(), enm.m_variants.end(), [&](const auto& x) { return x.first == des_name; }) - enm.m_variants.begin();
+                if( idx == enm.m_variants.size() ) {
+                    ERROR(sp, E0000, "Couldn't find enum variant " << e.path);
+                }
+                const auto& var = enm.m_variants[idx].second;
+                TU_IFLET(::HIR::Enum::Variant, var, Tuple, _,
+                    // All good
+                )
+                else {
+                    ERROR(sp, E0000, "Enum tuple pattern on non-tuple variant " << e.path);
+                }
+                fix_type_params(sp, enm.m_params,  e.path.m_params);
+                e.binding_ptr = &enm;
+                e.binding_idx = idx;
+                ),
             (EnumStruct,
                 const auto& enm = *reinterpret_cast< const ::HIR::Enum*>( get_type_pointer(sp, m_crate, e.path.m_path, Target::EnumVariant) );
                 const auto& des_name = e.path.m_path.m_components.back();
diff --git a/src/hir_typeck/expr.cpp b/src/hir_typeck/expr.cpp
index 18937155..e77c27a6 100644
--- a/src/hir_typeck/expr.cpp
+++ b/src/hir_typeck/expr.cpp
@@ -378,6 +378,28 @@ namespace {
                     )
                 )
                 ),
+            (StructTupleWildcard,
+                this->add_ivars_params( e.path.m_params );
+                if( type.m_data.is_Infer() ) {
+                    type.m_data = ::HIR::TypeRef::Data::make_Path( {e.path.clone(), ::HIR::TypeRef::TypePathBinding(e.binding)} );
+                }
+                assert(e.binding);
+                const auto& str = *e.binding;
+                // - assert check from earlier pass
+                assert( str.m_data.is_Tuple() );
+                
+                TU_MATCH_DEF(::HIR::TypeRef::Data, (type.m_data), (te),
+                (
+                    // TODO: Type mismatch
+                    ),
+                (Infer, throw ""; ),
+                (Path,
+                    if( ! te.binding.is_Struct() || te.binding.as_Struct() != &str ) {
+                        ERROR(sp, E0000, "Type mismatch in struct pattern - " << type << " is not " << e.path);
+                    }
+                    )
+                )
+                ),
             (Struct,
                 this->add_ivars_params( e.path.m_params );
                 if( type.m_data.is_Infer() ) {
@@ -453,13 +475,37 @@ namespace {
                             this->add_binding(e.sub_patterns[i], var_ty);
                         }
                         else {
-                            // SAFE: Can't have _ as monomorphise_type_needed checks for that
+                            // SAFE: Can't have a _ (monomorphise_type_needed checks for that)
                             this->add_binding(e.sub_patterns[i], const_cast< ::HIR::TypeRef&>(tup_var[i]));
                         }
                     }
                     )
                 )
                 ),
+            (EnumTupleWildcard,
+                this->add_ivars_params( e.path.m_params );
+                if( type.m_data.is_Infer() ) {
+                    auto path = e.path.clone();
+                    path.m_path.m_components.pop_back();
+                    type.m_data = ::HIR::TypeRef::Data::make_Path( {mv$(path), ::HIR::TypeRef::TypePathBinding(e.binding_ptr)} );
+                }
+                assert(e.binding_ptr);
+                const auto& enm = *e.binding_ptr;
+                const auto& var = enm.m_variants[e.binding_idx].second;
+                assert(var.is_Tuple());
+                
+                TU_MATCH_DEF(::HIR::TypeRef::Data, (type.m_data), (te),
+                (
+                    // TODO: Type mismatch
+                    ),
+                (Infer, throw ""; ),
+                (Path,
+                    if( ! te.binding.is_Enum() || te.binding.as_Enum() != &enm ) {
+                        ERROR(sp, E0000, "Type mismatch in enum pattern - " << type << " is not " << e.path);
+                    }
+                    )
+                )
+                ),
             (EnumStruct,
                 this->add_ivars_params( e.path.m_params );
                 if( type.m_data.is_Infer() ) {
@@ -619,6 +665,8 @@ namespace {
                     )
                 )
                 ),
+            (StructTupleWildcard,
+                ),
             (Struct,
                 if( ty.m_data.is_Infer() ) {
                     //TODO: Does this lead to issues with generic parameters?
@@ -651,6 +699,8 @@ namespace {
                     )
                 )
                 ),
+            (EnumTupleWildcard,
+                ),
             (EnumStruct,
                 if( ty.m_data.is_Infer() ) {
                     TODO(sp, "EnumStruct - infer");
diff --git a/src/parse/pattern.cpp b/src/parse/pattern.cpp
index e67647bd..5d13cba6 100644
--- a/src/parse/pattern.cpp
+++ b/src/parse/pattern.cpp
@@ -171,8 +171,8 @@ AST::Pattern Parse_PatternReal1(TokenStream& lex, bool is_refutable)
     {
     case TOK_UNDERSCORE:
         return AST::Pattern( );
-    case TOK_DOUBLE_DOT:
-        return AST::Pattern( AST::Pattern::TagWildcard() );
+    //case TOK_DOUBLE_DOT:
+    //    return AST::Pattern( AST::Pattern::TagWildcard() );
     case TOK_RWORD_BOX:
         return AST::Pattern( AST::Pattern::TagBox(), Parse_Pattern(lex, is_refutable) );
     case TOK_DOUBLE_AMP:
@@ -240,6 +240,11 @@ AST::Pattern Parse_PatternReal_Path(TokenStream& lex, AST::Path path, bool is_re
     switch( GET_TOK(tok, lex) )
     {
     case TOK_PAREN_OPEN:
+        if( LOOK_AHEAD(lex) == TOK_DOUBLE_DOT ) {
+            GET_TOK(tok, lex);
+            GET_CHECK_TOK(tok, lex, TOK_PAREN_CLOSE);
+            return AST::Pattern( AST::Pattern::TagEnumVariant(), ::std::move(path) );
+        }
         return AST::Pattern( AST::Pattern::TagEnumVariant(), ::std::move(path), Parse_PatternList(lex, is_refutable) );
     case TOK_BRACE_OPEN:
         return Parse_PatternStruct(lex, ::std::move(path), is_refutable);
@@ -331,6 +336,7 @@ AST::Pattern Parse_PatternStruct(TokenStream& lex, AST::Path path, bool is_refut
     TRACE_FUNCTION;
     Token tok;
     
+    bool is_exhaustive = true;
     ::std::vector< ::std::pair< ::std::string, AST::Pattern> >  subpats;
     do {
         GET_TOK(tok, lex);
@@ -338,6 +344,7 @@ AST::Pattern Parse_PatternStruct(TokenStream& lex, AST::Path path, bool is_refut
         if( tok.type() == TOK_BRACE_CLOSE )
             break;
         if( tok.type() == TOK_DOUBLE_DOT ) {
+            is_exhaustive = false;
             GET_TOK(tok, lex);
             break;
         }
@@ -391,6 +398,6 @@ AST::Pattern Parse_PatternStruct(TokenStream& lex, AST::Path path, bool is_refut
     } while( GET_TOK(tok, lex) == TOK_COMMA );
     CHECK_TOK(tok, TOK_BRACE_CLOSE);
     
-    return AST::Pattern(AST::Pattern::TagStruct(), ::std::move(path), ::std::move(subpats));
+    return AST::Pattern(AST::Pattern::TagStruct(), ::std::move(path), ::std::move(subpats), is_exhaustive);
 }
 
diff --git a/src/resolve/absolute.cpp b/src/resolve/absolute.cpp
index 5137aca6..05fa7523 100644
--- a/src/resolve/absolute.cpp
+++ b/src/resolve/absolute.cpp
@@ -1082,8 +1082,10 @@ void Resolve_Absolute_Pattern(Context& context, bool allow_refutable,  ::AST::Pa
         for(auto& sp : e.sub_patterns)
             Resolve_Absolute_Pattern(context, allow_refutable,  sp);
         ),
+    (WildcardStructTuple,
+        Resolve_Absolute_Path(context, pat.span(), Context::LookupMode::Pattern, e.path);
+        ),
     (StructTuple,
-        // TODO: This isn't a type lookup, it's a pattern lookup (allowing imported enum variants, e.g. `Some(_)` to work)
         Resolve_Absolute_Path(context, pat.span(), Context::LookupMode::Pattern, e.path);
         for(auto& sp : e.sub_patterns)
             Resolve_Absolute_Pattern(context, allow_refutable,  sp);