Fixes issue where cont/break/next stack isn't pushed for expression blocks.

src/compiler/sema_expr.c

@@ -4898,7 +4898,13 @@ static inline bool sema_expr_analyse_expr_block(Context *context, Type *to, Expr
 	Ast **saved_returns = context_push_returns(context);
 	context->expected_block_type = to;
 
+
 	SCOPE_START_WITH_FLAGS(SCOPE_EXPR_BLOCK)
+
+		PUSH_CONTINUE(NULL);
+		PUSH_BREAK(NULL);
+		PUSH_NEXT(NULL, NULL);
+
 		VECEACH(expr->expr_block.stmts, i)
 		{
 			if (!sema_analyse_statement(context, expr->expr_block.stmts[i]))
@@ -4925,7 +4931,11 @@ static inline bool sema_expr_analyse_expr_block(Context *context, Type *to, Expr
 			goto EXIT;
 		}
 		expr_set_type(expr, left_canonical);
-EXIT:
+
+	EXIT:
+		POP_BREAKCONT();
+		POP_NEXT();
+
 	SCOPE_END;
 	context_pop_returns(context, saved_returns);
 	expr->failable = context->expr_failable_return;

src/compiler/sema_stmts.c

@@ -895,7 +895,7 @@ static bool sema_analyse_break_stmt(Context *context, Ast *statement)
 		}
 		else
 		{
-			SEMA_ERROR(statement, "'break' is not allowed here.");
+			SEMA_ERROR(statement, "There is no valid target for 'break', did you make a mistake?");
 		}
 		return false;
 	}

test/test_suite/expression_block/expression_block_break.c3

@@ -0,0 +1,13 @@
+module fe;
+import std::io;
+extern func int printf(char *str, ...);
+
+func int main()
+{
+    while(true)
+    {
+        return {| break; return 0; |}; // #error: There is no valid target for 'break', did you make a mistake
+    }
+    io::println("I didn't return.");
+    return 0;
+}