zc: add the defer statement

defer expr; and defer { ... } register code that runs when the enclosing
block ends: at the end of the block, and at return, break and continue
that leave it. the tokens are kept at the defer and compiled again at each
exit (block_close, body, kw_return, kw_break, kw_continue), newest first,
before the block's variables are released, so the analyzer sees a deferred
rt.free(p) as the transfer of p where it runs. names mean what they meant
at the defer; values are read when it runs. return, break and continue
inside a deferred statement are errors, reported once. works in unchecked
code and closures (own base per function context).

1 files changed, 1 insertions, 1 deletions

diff --git a/editors/vscode/syntaxes/zc.tmLanguage.json b/editors/vscode/syntaxes/zc.tmLanguage.json
index 6f76e03..fab026b 100644
--- a/editors/vscode/syntaxes/zc.tmLanguage.json
+++ b/editors/vscode/syntaxes/zc.tmLanguage.json
@@ -83,7 +83,7 @@
       "patterns": [
         {
           "name": "keyword.control.zc",
-          "match": "\\b(if|else|while|do|for|switch|case|default|break|continue|return)\\b"
+          "match": "\\b(if|else|while|do|for|switch|case|default|break|continue|return|defer)\\b"
         },
         {
           "name": "keyword.declaration.zc",