Rename ra_syntax -> syntax

crates/syntax/src/validation/block.rs

@@ -0,0 +1,22 @@
+//! Logic for validating block expressions i.e. `ast::BlockExpr`.
+
+use crate::{
+    ast::{self, AstNode, AttrsOwner},
+    SyntaxError,
+    SyntaxKind::*,
+};
+
+pub(crate) fn validate_block_expr(block: ast::BlockExpr, errors: &mut Vec<SyntaxError>) {
+    if let Some(parent) = block.syntax().parent() {
+        match parent.kind() {
+            FN | EXPR_STMT | BLOCK_EXPR => return,
+            _ => {}
+        }
+    }
+    errors.extend(block.attrs().map(|attr| {
+        SyntaxError::new(
+            "A block in this position cannot accept inner attributes",
+            attr.syntax().text_range(),
+        )
+    }))
+}