================
@@ -79,8 +79,24 @@ enum class StringLiteralKind;
 // AST classes for statements.
 
//===----------------------------------------------------------------------===//
 
-/// Stmt - This represents one statement.
+/// A statement or expression in the program.
 ///
+/// This is the base for the hierarchy of statements (ForStmt, ReturnStmt...)
+/// as well as expressions (Expr, CastExpr, IntegerLiteral...).
+/// Classing expressions as Stmt allows them to appear as statements without
+/// needing an extra "expression-statement" node.
+///
+/// Statements can have children and so form trees. e.g. `while (i>0) i--;`
+///
+///   WhileStmt
+///   |-BinaryOperator >
+///   | |-DeclRefExpr i
+///   | `-IntegerLiteral 0
+///   `-UnaryOperator --
+///       DeclRefExpr i
+///
----------------
sam-mccall wrote:

Thanks, this was indeed being mangled.

I've instead indented by two more spaces. Doxygen understands this part of 
markdown, and I think it keeps the source file more readable.


https://github.com/llvm/llvm-project/pull/109795
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