diff --git a/js-css-interop.reb b/js-css-interop.reb
index eb98b10..0bbd627 100644
--- a/js-css-interop.reb
+++ b/js-css-interop.reb
@@ -56,7 +56,7 @@ detect-automime: func [
         "https://" [
             hostname: "raw.githubusercontent.com" "/" to <end>
             |
-            hostname: "gitlab.com" "/" thru "/" thru "/" opt "-/" "raw/" to <end>
+            hostname: "gitlab.com" "/" thru "/" thru "/" try "-/" "raw/" to <end>
         ]
     ] then [
         if hostname <> js-eval "window.location.hostname" [
diff --git a/main.reb b/main.reb
index 2c92da0..1dc4a63 100644
--- a/main.reb
+++ b/main.reb
@@ -94,7 +94,7 @@ export main: adapt :console [
     ;
     let autorun: null
     let importing: false
-    parse system.options.args [maybe some [
+    parse system.options.args [try some [
         start: <here>
         ||
         ; local, remote, tracing_on, git_commit not passed through by the
diff --git a/replpad.reb b/replpad.reb
index ea70624..ec7b415 100644
--- a/replpad.reb
+++ b/replpad.reb
@@ -283,7 +283,7 @@ replpad-write: func [
     ; https://developer.mozilla.org/en-US/docs/Web/CSS/white-space
 
     let url-rule: [
-        "http" opt "s" ":" to ["]" | ")" | {"} | "'" | space | newline | end]
+        "http" try "s" ":" to ["]" | ")" | {"} | "'" | space | newline | end]
     ]
 
     ; UPARSE is still orders of magnitude slower than native PARSE.  Until that
@@ -291,7 +291,7 @@ replpad-write: func [
 
     let url
     parse3 param: copy param [
-        maybe some [
+        try some [
             change '< ("&lt;")
             | change '> ("&gt;")
             | change '& ("&amp;")
@@ -393,7 +393,7 @@ CORSify-gitlab-port: func [
         "/"
         emit user: between <here> "/"
         emit repo: between <here> "/"
-        [opt "-/"]  ; TBD: figure out what this is for, but skip for now
+        [try "-/"]  ; TBD: figure out what this is for, but skip for now
         "raw/"
         emit branch: between <here> "/"
         emit file_path: between <here> <end>
diff --git a/tests/interactive.test.reb b/tests/interactive.test.reb
index c5f11a6..84931d6 100644
--- a/tests/interactive.test.reb
+++ b/tests/interactive.test.reb
@@ -150,9 +150,9 @@ k: ok: okay: function [
 
     steps: parse steps [
         label: issue!
-        opt bug: integer!  ; optional GitHub issue number
+        try bug: integer!  ; optional GitHub issue number
         description: across [some text!] (print description)
-        opt [code: group! (do as block! code)]
+        try [code: group! (do as block! code)]
         accept <here>
     ] else [
         fail "Problem in STEPS parsing"