error handling kickoff

compiler/ast/ast.odin

@@ -99,6 +99,8 @@ Expr_Kind :: enum u8 {
 	Or,
 	Range,
 	Call,
+	Try,
+	Catch,
 }
 
 Expr :: struct {
@@ -109,6 +111,7 @@ Expr :: struct {
 	name:       symbol.Id,
 	left:       Expr_Id,
 	right:      Expr_Id,
+	body:       []Stmt_Id,
 	diagnostic: source.Diagnostic_Id,
 	parenthesized: bool,
 	kind:       Expr_Kind,
@@ -204,6 +207,7 @@ Function :: struct {
 	variadic:   bool,
 	params:     []Param,
 	result:     Type_Syntax,
+	error:      Type_Syntax,
 	body:       []Stmt_Id,
 	link_name:  string,
 	unsupported_reason: string,
@@ -304,6 +308,7 @@ init_module :: proc(allocator := context.allocator) -> Module {
 destroy_module :: proc(module: ^Module) {
 	for expr in module.exprs {
 		delete(expr.args, module.allocator)
+		delete(expr.body, module.allocator)
 	}
 	for statement in module.statements {
 		delete(statement.captures, module.allocator)