Pure functions!

4 files changed, 28 insertions, 30 deletions

diff --git a/tests/typ/code/closure.typ b/tests/typ/code/closure.typ
index aa7bc5b9..e9389e13 100644
--- a/tests/typ/code/closure.typ
+++ b/tests/typ/code/closure.typ
@@ -31,7 +31,7 @@
 ---
 // Capture environment.
 {
-  let mark = "?"
+  let mark = "!"
   let greet = {
     let hi = "Hi"
     name => {
@@ -39,9 +39,10 @@
     }
   }
 
-  test(greet("Typst"), "Hi, Typst?")
+  test(greet("Typst"), "Hi, Typst!")
 
-  mark = "!"
+  // Changing the captured variable after the closure definition has no effect.
+  mark = "?"
   test(greet("Typst"), "Hi, Typst!")
 }
 
@@ -71,12 +72,12 @@
 // For loop bindings.
 {
   let v = (1, 2, 3)
-  let s = 0
   let f() = {
+    let s = 0
     for v in v { s += v }
+    s
   }
-  f()
-  test(s, 6)
+  test(f(), 6)
 }
 
 ---
diff --git a/tests/typ/code/return.typ b/tests/typ/code/return.typ
index 8db99a81..0eea394e 100644
--- a/tests/typ/code/return.typ
+++ b/tests/typ/code/return.typ
@@ -55,30 +55,28 @@
 
 ---
 // Test that the expression is evaluated to the end.
-#let y = 1
-#let identity(x, ..rest) = x
-#let f(x) = {
-  identity(
-    ..return,
-    x + 1,
-    y = 2,
-  )
+#let sum(..args) = {
+  let s = 0
+  for v in args.positional() {
+    s += v
+  }
+  s
+}
+
+#let f() = {
+  sum(..return, 1, 2, 3)
   "nope"
 }
 
-#test(f(1), 2)
-#test(y, 2)
+#test(f(), 6)
 
 ---
 // Test value return from content.
 #let x = 3
 #let f() = [
   Hello 😀
-  { x = 1 }
   #return "nope"
-  { x = 2 }
   World
 ]
 
 #test(f(), "nope")
-#test(x, 1)
diff --git a/tests/typ/code/spread.typ b/tests/typ/code/spread.typ
index 86dbfd98..ff661ead 100644
--- a/tests/typ/code/spread.typ
+++ b/tests/typ/code/spread.typ
@@ -23,16 +23,14 @@
 }
 
 ---
-// Test storing arguments in a variable.
+// Test doing things with arguments.
 {
-  let args
-  let save(..sink) = {
-    args = sink
+  let save(..args) = {
+    test(type(args), "arguments")
+    test(repr(args), "(1, 2, three: true)")
   }
 
   save(1, 2, three: true)
-  test(type(args), "arguments")
-  test(repr(args), "(1, 2, three: true)")
 }
 
 ---
diff --git a/tests/typ/layout/stack-1.typ b/tests/typ/layout/stack-1.typ
index 19a00de5..0ecbe246 100644
--- a/tests/typ/layout/stack-1.typ
+++ b/tests/typ/layout/stack-1.typ
@@ -7,13 +7,14 @@
   30pt, 50%, 20pt, 100%,
 )
 
-#let shaded = {
-  let v = 0%
-  let next() = { v += 10%; rgb(v, v, v) }
-  w => rect(width: w, height: 10pt, fill: next())
+#let shaded(i, w) = {
+  let v = (i + 1) * 10%
+  rect(width: w, height: 10pt, fill: rgb(v, v, v))
 }
 
-#let items = for w in widths { (align(right, shaded(w)),) }
+#let items = for i, w in widths {
+  (align(right, shaded(i, w)),)
+}
 
 #set page(width: 50pt, margins: 0pt)
 #stack(dir: btt, ..items)