From 2389cf96dd07d8c94da349b10f6f2b750707dfd9 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sun, 11 Feb 2018 11:01:00 +0300
Subject: G: Never type

---
 src/parser/grammar/items/consts.rs           |  2 +-
 src/parser/grammar/items/mod.rs              |  2 +-
 src/parser/grammar/items/structs.rs          |  4 ++--
 src/parser/grammar/type_params.rs            |  2 +-
 src/parser/grammar/types.rs                  | 18 ++++++++++++++----
 tests/data/parser/inline/0020_never_type.rs  |  1 +
 tests/data/parser/inline/0020_never_type.txt | 13 +++++++++++++
 7 files changed, 33 insertions(+), 9 deletions(-)
 create mode 100644 tests/data/parser/inline/0020_never_type.rs
 create mode 100644 tests/data/parser/inline/0020_never_type.txt

diff --git a/src/parser/grammar/items/consts.rs b/src/parser/grammar/items/consts.rs
index 5f3cf58c2..d6c3753b3 100644
--- a/src/parser/grammar/items/consts.rs
+++ b/src/parser/grammar/items/consts.rs
@@ -14,7 +14,7 @@ fn const_or_static(p: &mut Parser, kw: SyntaxKind) {
     p.eat(MUT_KW); // TODO: validator to forbid const mut
     name(p);
     p.expect(COLON);
-    types::ty(p);
+    types::type_(p);
     p.expect(EQ);
     expressions::expr(p);
     p.expect(SEMI);
diff --git a/src/parser/grammar/items/mod.rs b/src/parser/grammar/items/mod.rs
index f1776e0e2..b1edf2f22 100644
--- a/src/parser/grammar/items/mod.rs
+++ b/src/parser/grammar/items/mod.rs
@@ -247,7 +247,7 @@ fn type_item(p: &mut Parser) {
     type_params::where_clause(p);
 
     p.expect(EQ);
-    types::ty(p);
+    types::type_(p);
     p.expect(SEMI);
 }
 
diff --git a/src/parser/grammar/items/structs.rs b/src/parser/grammar/items/structs.rs
index ad18fd270..c72b50808 100644
--- a/src/parser/grammar/items/structs.rs
+++ b/src/parser/grammar/items/structs.rs
@@ -89,7 +89,7 @@ fn named_fields(p: &mut Parser) {
         if p.at(IDENT) {
             name(p);
             p.expect(COLON);
-            types::ty(p);
+            types::type_(p);
             field.complete(p, NAMED_FIELD);
         } else {
             field.abandon(p);
@@ -105,7 +105,7 @@ fn pos_fields(p: &mut Parser) {
     while !p.at(R_PAREN) && !p.at(EOF) {
         let pos_field = p.start();
         visibility(p);
-        types::ty(p);
+        types::type_(p);
         pos_field.complete(p, POS_FIELD);
 
         if !p.at(R_PAREN) {
diff --git a/src/parser/grammar/type_params.rs b/src/parser/grammar/type_params.rs
index 2462b260e..9ea08a55c 100644
--- a/src/parser/grammar/type_params.rs
+++ b/src/parser/grammar/type_params.rs
@@ -62,7 +62,7 @@ pub(super) fn list(p: &mut Parser) {
             }
         }
         if p.at(EQ) {
-            types::ty(p)
+            types::type_(p)
         }
         m.complete(p, TYPE_PARAM);
     }
diff --git a/src/parser/grammar/types.rs b/src/parser/grammar/types.rs
index 71801d8ef..2ae583bd1 100644
--- a/src/parser/grammar/types.rs
+++ b/src/parser/grammar/types.rs
@@ -1,8 +1,9 @@
 use super::*;
 
-pub(super) fn ty(p: &mut Parser) {
+pub(super) fn type_(p: &mut Parser) {
     match p.current() {
-        L_PAREN => paren_or_tuple_ty(p),
+        L_PAREN => paren_or_tuple_type(p),
+        EXCL => never_type(p),
         IDENT => path_type(p),
         _ => {
             p.error("expected type");
@@ -10,7 +11,7 @@ pub(super) fn ty(p: &mut Parser) {
     }
 }
 
-fn paren_or_tuple_ty(p: &mut Parser) {
+fn paren_or_tuple_type(p: &mut Parser) {
     assert!(p.at(L_PAREN));
     let m = p.start();
     p.bump();
@@ -18,7 +19,7 @@ fn paren_or_tuple_ty(p: &mut Parser) {
     let mut trailing_comma: bool = false;
     while !p.at(EOF) && !p.at(R_PAREN) {
         n_types += 1;
-        ty(p);
+        type_(p);
         if p.eat(COMMA) {
             trailing_comma = true;
         } else {
@@ -43,6 +44,15 @@ fn paren_or_tuple_ty(p: &mut Parser) {
     m.complete(p, kind);
 }
 
+// test never_type
+// type Never = !;
+fn never_type(p: &mut Parser) {
+    assert!(p.at(EXCL));
+    let m = p.start();
+    p.bump();
+    m.complete(p, NEVER_TYPE);
+}
+
 fn path_type(p: &mut Parser) {
     assert!(p.at(IDENT));
     let m = p.start();
diff --git a/tests/data/parser/inline/0020_never_type.rs b/tests/data/parser/inline/0020_never_type.rs
new file mode 100644
index 000000000..de399fcf4
--- /dev/null
+++ b/tests/data/parser/inline/0020_never_type.rs
@@ -0,0 +1 @@
+type Never = !;
diff --git a/tests/data/parser/inline/0020_never_type.txt b/tests/data/parser/inline/0020_never_type.txt
new file mode 100644
index 000000000..935f33459
--- /dev/null
+++ b/tests/data/parser/inline/0020_never_type.txt
@@ -0,0 +1,13 @@
+FILE@[0; 16)
+  TYPE_ITEM@[0; 16)
+    TYPE_KW@[0; 4)
+    NAME@[4; 11)
+      WHITESPACE@[4; 5)
+      IDENT@[5; 10) "Never"
+      WHITESPACE@[10; 11)
+    EQ@[11; 12)
+    NEVER_TYPE@[12; 14)
+      WHITESPACE@[12; 13)
+      EXCL@[13; 14)
+    SEMI@[14; 15)
+    WHITESPACE@[15; 16)
-- 
cgit v1.2.3