diff --git a/src/grammar.ron b/src/grammar.ron
index fca29f1efe..e10e5aaf46 100644
--- a/src/grammar.ron
+++ b/src/grammar.ron
@@ -158,6 +158,7 @@ Grammar(
         "TYPE_ARG_LIST",
 
         "PARAM_LIST",
+        "SELF_PARAM",
         "ARG_LIST",
     ]
 )
diff --git a/src/parser/grammar/items/traits.rs b/src/parser/grammar/items/traits.rs
index 812cacfb7e..7d657ced03 100644
--- a/src/parser/grammar/items/traits.rs
+++ b/src/parser/grammar/items/traits.rs
@@ -29,6 +29,17 @@ pub(super) fn impl_item(p: &mut Parser) {
     }
     type_params::where_clause(p);
     p.expect(L_CURLY);
+
+    // test impl_item_items
+    // impl F {
+    //     type A = i32;
+    //     const B: i32 = 92;
+    //     fn foo() {}
+    //     fn bar(&self) {}
+    // }
+    while !p.at(EOF) && !p.at(R_CURLY) {
+        item(p);
+    }
     p.expect(R_CURLY);
 }
 
diff --git a/src/parser/grammar/mod.rs b/src/parser/grammar/mod.rs
index 498b45d443..b8847fb68b 100644
--- a/src/parser/grammar/mod.rs
+++ b/src/parser/grammar/mod.rs
@@ -104,6 +104,7 @@ fn fn_value_parameters(p: &mut Parser) {
     assert!(p.at(L_PAREN));
     let m = p.start();
     p.bump();
+    self_param(p);
     while !p.at(EOF) && !p.at(R_PAREN) {
         value_parameter(p);
         if !p.at(R_PAREN) {
@@ -120,6 +121,29 @@ fn fn_value_parameters(p: &mut Parser) {
         types::type_(p);
         m.complete(p, VALUE_PARAMETER);
     }
+
+    // test self_param
+    // impl S {
+    //     fn a(self) {}
+    //     fn b(&self,) {}
+    //     fn c(&mut self, x: i32) {}
+    // }
+    fn self_param(p: &mut Parser) {
+        let la1 = p.nth(1);
+        let la2 = p.nth(2);
+        let n_toks = match (p.current(), la1, la2) {
+            (SELF_KW, _, _) => 1,
+            (AMPERSAND, SELF_KW, _) => 2,
+            (AMPERSAND, MUT_KW, SELF_KW) => 3,
+            _ => return,
+        };
+        let m = p.start();
+        for _ in 0..n_toks { p.bump(); }
+        m.complete(p, SELF_PARAM);
+        if !p.at(R_PAREN) {
+            p.expect(COMMA);
+        }
+    }
 }
 
 fn fn_ret_type(p: &mut Parser) {
diff --git a/src/syntax_kinds/generated.rs b/src/syntax_kinds/generated.rs
index 699f5282e7..0603f53fdc 100644
--- a/src/syntax_kinds/generated.rs
+++ b/src/syntax_kinds/generated.rs
@@ -145,6 +145,7 @@ pub enum SyntaxKind {
     TYPE_PARAM_LIST,
     TYPE_ARG_LIST,
     PARAM_LIST,
+    SELF_PARAM,
     ARG_LIST,
     // Technical SyntaxKinds: they appear temporally during parsing,
     // but never end up in the final tree
@@ -298,6 +299,7 @@ impl SyntaxKind {
             TYPE_PARAM_LIST => &SyntaxInfo { name: "TYPE_PARAM_LIST" },
             TYPE_ARG_LIST => &SyntaxInfo { name: "TYPE_ARG_LIST" },
             PARAM_LIST => &SyntaxInfo { name: "PARAM_LIST" },
+            SELF_PARAM => &SyntaxInfo { name: "SELF_PARAM" },
             ARG_LIST => &SyntaxInfo { name: "ARG_LIST" },
             TOMBSTONE => &SyntaxInfo { name: "TOMBSTONE" },
             EOF => &SyntaxInfo { name: "EOF" },
diff --git a/tests/data/parser/inline/0054_impl_item_items.rs b/tests/data/parser/inline/0054_impl_item_items.rs
new file mode 100644
index 0000000000..f108514879
--- /dev/null
+++ b/tests/data/parser/inline/0054_impl_item_items.rs
@@ -0,0 +1,6 @@
+impl F {
+    type A = i32;
+    const B: i32 = 92;
+    fn foo() {}
+    fn bar(&self) {}
+}
diff --git a/tests/data/parser/inline/0054_impl_item_items.txt b/tests/data/parser/inline/0054_impl_item_items.txt
new file mode 100644
index 0000000000..739f3d0f9b
--- /dev/null
+++ b/tests/data/parser/inline/0054_impl_item_items.txt
@@ -0,0 +1,77 @@
+FILE@[0; 89)
+  IMPL_ITEM@[0; 89)
+    IMPL_KW@[0; 4)
+    PATH_TYPE@[4; 7)
+      PATH@[4; 7)
+        PATH_SEGMENT@[4; 7)
+          NAME_REF@[4; 7)
+            WHITESPACE@[4; 5)
+            IDENT@[5; 6) "F"
+            WHITESPACE@[6; 7)
+    L_CURLY@[7; 8)
+    TYPE_ITEM@[8; 31)
+      WHITESPACE@[8; 13)
+      TYPE_KW@[13; 17)
+      NAME@[17; 20)
+        WHITESPACE@[17; 18)
+        IDENT@[18; 19) "A"
+        WHITESPACE@[19; 20)
+      EQ@[20; 21)
+      PATH_TYPE@[21; 25)
+        PATH@[21; 25)
+          PATH_SEGMENT@[21; 25)
+            NAME_REF@[21; 25)
+              WHITESPACE@[21; 22)
+              IDENT@[22; 25) "i32"
+      SEMI@[25; 26)
+      WHITESPACE@[26; 31)
+    CONST_ITEM@[31; 54)
+      CONST_KW@[31; 36)
+      NAME@[36; 38)
+        WHITESPACE@[36; 37)
+        IDENT@[37; 38) "B"
+      COLON@[38; 39)
+      PATH_TYPE@[39; 44)
+        PATH@[39; 44)
+          PATH_SEGMENT@[39; 44)
+            NAME_REF@[39; 44)
+              WHITESPACE@[39; 40)
+              IDENT@[40; 43) "i32"
+              WHITESPACE@[43; 44)
+      EQ@[44; 45)
+      LITERAL@[45; 48)
+        WHITESPACE@[45; 46)
+        INT_NUMBER@[46; 48)
+      SEMI@[48; 49)
+      WHITESPACE@[49; 54)
+    FN_ITEM@[54; 70)
+      FN_KW@[54; 56)
+      NAME@[56; 60)
+        WHITESPACE@[56; 57)
+        IDENT@[57; 60) "foo"
+      PARAM_LIST@[60; 63)
+        L_PAREN@[60; 61)
+        R_PAREN@[61; 62)
+        WHITESPACE@[62; 63)
+      BLOCK@[63; 70)
+        L_CURLY@[63; 64)
+        R_CURLY@[64; 65)
+        WHITESPACE@[65; 70)
+    FN_ITEM@[70; 87)
+      FN_KW@[70; 72)
+      NAME@[72; 76)
+        WHITESPACE@[72; 73)
+        IDENT@[73; 76) "bar"
+      PARAM_LIST@[76; 84)
+        L_PAREN@[76; 77)
+        SELF_PARAM@[77; 82)
+          AMPERSAND@[77; 78)
+          SELF_KW@[78; 82)
+        R_PAREN@[82; 83)
+        WHITESPACE@[83; 84)
+      BLOCK@[84; 87)
+        L_CURLY@[84; 85)
+        R_CURLY@[85; 86)
+        WHITESPACE@[86; 87)
+    R_CURLY@[87; 88)
+    WHITESPACE@[88; 89)
diff --git a/tests/data/parser/inline/0055_self_param.rs b/tests/data/parser/inline/0055_self_param.rs
new file mode 100644
index 0000000000..2890c27e2f
--- /dev/null
+++ b/tests/data/parser/inline/0055_self_param.rs
@@ -0,0 +1,5 @@
+impl S {
+    fn a(self) {}
+    fn b(&self,) {}
+    fn c(&mut self, x: i32) {}
+}