Add test suggest-self-in-bare-function

Signed-off-by: xizheyin <[email protected]>

Author: xizheyin

tests/ui/parser/suggest-self-in-bare-function.rs

@@ -0,0 +1,17 @@
+// We should not suggest `self` in bare functions.
+// And a note for RFC 1685 should not be shown.
+// See #144968
+
+fn is_even(value) -> bool { //~ ERROR expected one of `:`, `@`, or `|`, found `)`
+    value % 2 == 0
+}
+
+struct S;
+
+impl S {
+    fn is_even(value) -> bool { //~ ERROR expected one of `:`, `@`, or `|`, found `)`
+        value % 2 == 0
+    }    
+}
+
+fn main() {}

tests/ui/parser/suggest-self-in-bare-function.stderr

@@ -0,0 +1,42 @@
+error: expected one of `:`, `@`, or `|`, found `)`
+  --> $DIR/suggest-self-in-bare-function.rs:5:17
+   |
+LL | fn is_even(value) -> bool {
+   |                 ^ expected one of `:`, `@`, or `|`
+   |
+   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
+help: if this is a `self` type, give it a parameter name
+   |
+LL | fn is_even(self: value) -> bool {
+   |            +++++
+help: if this is a parameter name, give it a type
+   |
+LL | fn is_even(value: TypeName) -> bool {
+   |                 ++++++++++
+help: if this is a type, explicitly ignore the parameter name
+   |
+LL | fn is_even(_: value) -> bool {
+   |            ++
+
+error: expected one of `:`, `@`, or `|`, found `)`
+  --> $DIR/suggest-self-in-bare-function.rs:12:21
+   |
+LL |     fn is_even(value) -> bool {
+   |                     ^ expected one of `:`, `@`, or `|`
+   |
+   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
+help: if this is a `self` type, give it a parameter name
+   |
+LL |     fn is_even(self: value) -> bool {
+   |                +++++
+help: if this is a parameter name, give it a type
+   |
+LL |     fn is_even(value: TypeName) -> bool {
+   |                     ++++++++++
+help: if this is a type, explicitly ignore the parameter name
+   |
+LL |     fn is_even(_: value) -> bool {
+   |                ++
+
+error: aborting due to 2 previous errors
+