impl trait type

src/grammar.ron

@@ -118,6 +118,7 @@ Grammar(
         "PLACEHOLDER_TYPE",
         "FN_POINTER_TYPE",
         "FOR_TYPE",
+        "IMPL_TRAIT_TYPE",
 
         "REF_PAT",
         "BIND_PAT",

src/parser/grammar/type_params.rs

@@ -57,6 +57,10 @@ pub(super) fn list(p: &mut Parser) {
 pub(super) fn bounds(p: &mut Parser) {
     assert!(p.at(COLON));
     p.bump();
+    bounds_without_colon(p);
+}
+
+pub(super) fn bounds_without_colon(p: &mut Parser) {
     loop {
         let has_paren = p.eat(L_PAREN);
         p.eat(QUESTION);
@@ -79,6 +83,7 @@ pub(super) fn bounds(p: &mut Parser) {
     }
 }
 
+
 pub(super) fn where_clause(p: &mut Parser) {
     if p.at(WHERE_KW) {
         let m = p.start();

src/parser/grammar/types.rs

@@ -10,6 +10,7 @@ pub(super) fn type_(p: &mut Parser) {
         UNDERSCORE => placeholder_type(p),
         FN_KW | UNSAFE_KW | EXTERN_KW => fn_pointer_type(p),
         FOR_KW => for_type(p),
+        IMPL_KW => impl_trait_type(p),
         _ if paths::is_path_start(p) => path_type(p),
         _ => {
             p.error("expected type");
@@ -183,6 +184,16 @@ fn for_type(p: &mut Parser) {
     m.complete(p, FOR_TYPE);
 }
 
+// test impl_trait_type
+// type A = impl Iterator<Item=Foo<'a>> + 'a;
+fn impl_trait_type(p: &mut Parser) {
+    assert!(p.at(IMPL_KW));
+    let m = p.start();
+    p.bump();
+    type_params::bounds_without_colon(p);
+    m.complete(p, IMPL_TRAIT_TYPE);
+}
+
 // test path_type
 // type A = Foo;
 // type B = ::Foo;

src/syntax_kinds/generated.rs

@@ -111,6 +111,7 @@ pub enum SyntaxKind {
     PLACEHOLDER_TYPE,
     FN_POINTER_TYPE,
     FOR_TYPE,
+    IMPL_TRAIT_TYPE,
     REF_PAT,
     BIND_PAT,
     PLACEHOLDER_PAT,
@@ -271,6 +272,7 @@ impl SyntaxKind {
             PLACEHOLDER_TYPE => &SyntaxInfo { name: "PLACEHOLDER_TYPE" },
             FN_POINTER_TYPE => &SyntaxInfo { name: "FN_POINTER_TYPE" },
             FOR_TYPE => &SyntaxInfo { name: "FOR_TYPE" },
+            IMPL_TRAIT_TYPE => &SyntaxInfo { name: "IMPL_TRAIT_TYPE" },
             REF_PAT => &SyntaxInfo { name: "REF_PAT" },
             BIND_PAT => &SyntaxInfo { name: "BIND_PAT" },
             PLACEHOLDER_PAT => &SyntaxInfo { name: "PLACEHOLDER_PAT" },

tests/data/parser/inline/0063_impl_trait_type.rs

@@ -0,0 +1 @@
+type A = impl Iterator<Item=Foo<'a>> + 'a;

tests/data/parser/inline/0063_impl_trait_type.txt

@@ -0,0 +1,39 @@
+FILE@[0; 43)
+  TYPE_ITEM@[0; 43)
+    TYPE_KW@[0; 4)
+    NAME@[4; 7)
+      WHITESPACE@[4; 5)
+      IDENT@[5; 6) "A"
+      WHITESPACE@[6; 7)
+    EQ@[7; 8)
+    IMPL_TRAIT_TYPE@[8; 41)
+      WHITESPACE@[8; 9)
+      IMPL_KW@[9; 13)
+      PATH@[13; 37)
+        PATH_SEGMENT@[13; 37)
+          NAME_REF@[13; 22)
+            WHITESPACE@[13; 14)
+            IDENT@[14; 22) "Iterator"
+          TYPE_ARG_LIST@[22; 37)
+            L_ANGLE@[22; 23)
+            ASSOC_TYPE_ARG@[23; 35)
+              NAME_REF@[23; 27)
+                IDENT@[23; 27) "Item"
+              EQ@[27; 28)
+              PATH_TYPE@[28; 35)
+                PATH@[28; 35)
+                  PATH_SEGMENT@[28; 35)
+                    NAME_REF@[28; 31)
+                      IDENT@[28; 31) "Foo"
+                    TYPE_ARG_LIST@[31; 35)
+                      L_ANGLE@[31; 32)
+                      LIFETIME_ARG@[32; 34)
+                        LIFETIME@[32; 34) "'a"
+                      R_ANGLE@[34; 35)
+            R_ANGLE@[35; 36)
+            WHITESPACE@[36; 37)
+      PLUS@[37; 38)
+      WHITESPACE@[38; 39)
+      LIFETIME@[39; 41) "'a"
+    SEMI@[41; 42)
+    WHITESPACE@[42; 43)