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| -rw-r--r-- | doc/manual/stmts.txt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/manual/stmts.txt b/doc/manual/stmts.txt index 062c08d7c..a833d7b7d 100644 --- a/doc/manual/stmts.txt +++ b/doc/manual/stmts.txt @@ -60,6 +60,24 @@ An empty ``discard`` statement is often used as a null statement: else: discard +Void context +------------ + +In a list of statements every expression except the last one needs to have the +type ``void``. In addition to this rule an assignment to the builtin ``result`` +symbol also triggers a ``void`` context: + +.. code-block:: nim + proc invalid*(): string = + result = "foo" + "invalid" # Error: value of type 'string' has to be discarded + +.. code-block:: nim + proc valid*(): string = + let x = 317 + "valid" + + Var statement ------------- |