Merge #1847

1847: Allow an underscore as the identifier in `const` items r=matklad a=ecstatic-morse

[RFC 2526](https://github.com/rust-lang/rust/issues/54912) was recently stabilized, meaning `const _: i32 = 5;` is now a valid item.

Co-authored-by: Dylan MacKenzie <[email protected]>

2 files changed, 22 insertions, 0 deletions

diff --git a/crates/ra_syntax/test_data/parser/inline/err/0013_static_underscore.rs b/crates/ra_syntax/test_data/parser/inline/err/0013_static_underscore.rs
new file mode 100644
index 000000000..df8cecb43
--- /dev/null
+++ b/crates/ra_syntax/test_data/parser/inline/err/0013_static_underscore.rs
@@ -0,0 +1 @@
+static _: i32 = 5;
diff --git a/crates/ra_syntax/test_data/parser/inline/err/0013_static_underscore.txt b/crates/ra_syntax/test_data/parser/inline/err/0013_static_underscore.txt
new file mode 100644
index 000000000..28f75a341
--- /dev/null
+++ b/crates/ra_syntax/test_data/parser/inline/err/0013_static_underscore.txt
@@ -0,0 +1,21 @@
+SOURCE_FILE@[0; 19)
+  STATIC_DEF@[0; 18)
+    STATIC_KW@[0; 6) "static"
+    WHITESPACE@[6; 7) " "
+    ERROR@[7; 8)
+      UNDERSCORE@[7; 8) "_"
+    COLON@[8; 9) ":"
+    WHITESPACE@[9; 10) " "
+    PATH_TYPE@[10; 13)
+      PATH@[10; 13)
+        PATH_SEGMENT@[10; 13)
+          NAME_REF@[10; 13)
+            IDENT@[10; 13) "i32"
+    WHITESPACE@[13; 14) " "
+    EQ@[14; 15) "="
+    WHITESPACE@[15; 16) " "
+    LITERAL@[16; 17)
+      INT_NUMBER@[16; 17) "5"
+    SEMI@[17; 18) ";"
+  WHITESPACE@[18; 19) "\n"
+error 7: expected a name