internal: cleanup item parsing

crates/syntax/test_data/parser/inline/ok/0152_impl.rast

@@ -1,22 +0,0 @@
-SOURCE_FILE@0..16
-  IMPL@0..15
-    IMPL_KW@0..4 "impl"
-    WHITESPACE@4..5 " "
-    PATH_TYPE@5..6
-      PATH@5..6
-        PATH_SEGMENT@5..6
-          NAME_REF@5..6
-            IDENT@5..6 "T"
-    WHITESPACE@6..7 " "
-    FOR_KW@7..10 "for"
-    WHITESPACE@10..11 " "
-    PATH_TYPE@11..12
-      PATH@11..12
-        PATH_SEGMENT@11..12
-          NAME_REF@11..12
-            IDENT@11..12 "S"
-    WHITESPACE@12..13 " "
-    ASSOC_ITEM_LIST@13..15
-      L_CURLY@13..14 "{"
-      R_CURLY@14..15 "}"
-  WHITESPACE@15..16 "\n"

crates/syntax/test_data/parser/inline/ok/0152_impl.rs

@@ -1 +0,0 @@
-impl T for S {}

crates/syntax/test_data/parser/inline/ok/0153_trait.rast

@@ -1,11 +0,0 @@
-SOURCE_FILE@0..11
-  TRAIT@0..10
-    TRAIT_KW@0..5 "trait"
-    WHITESPACE@5..6 " "
-    NAME@6..7
-      IDENT@6..7 "T"
-    WHITESPACE@7..8 " "
-    ASSOC_ITEM_LIST@8..10
-      L_CURLY@8..9 "{"
-      R_CURLY@9..10 "}"
-  WHITESPACE@10..11 "\n"

crates/syntax/test_data/parser/inline/ok/0153_trait.rs

@@ -1 +0,0 @@
-trait T {}