Fix argument sinks

Fixes #886.

.github/workflows/ci.yml

@@ -1,6 +1,9 @@
 name: Continuous integration
 on: [push, pull_request]
 
+env:
+  RUSTFLAGS: "-Dwarnings"
+
 jobs:
   ci:
     runs-on: ubuntu-latest

library/src/compute/calc.rs

@@ -541,7 +541,7 @@ pub fn gcd(
     /// The second integer.
     b: i64,
 ) -> Value {
-    Value::Int(calculate_gcd(a, b).into())
+    Value::Int(calculate_gcd(a, b))
 }
 
 /// Calculates the greatest common divisor of two integers

src/eval/args.rs

@@ -62,14 +62,23 @@ impl Args {
     }
 
     /// Consume n positional arguments if possible.
-    pub fn consume(&mut self, n: usize) -> SourceResult<EcoVec<Arg>> {
-        if n > self.items.len() {
+    pub fn consume(&mut self, n: usize) -> SourceResult<Vec<Arg>> {
+        let mut list = vec![];
+
+        let mut i = 0;
+        while i < self.items.len() && list.len() < n {
+            if self.items[i].name.is_none() {
+                list.push(self.items.remove(i));
+            } else {
+                i += 1;
+            }
+        }
+
+        if list.len() < n {
             bail!(self.span, "not enough arguments");
         }
-        let vec = self.items.to_vec();
-        let (left, right) = vec.split_at(n);
-        self.items = right.into();
-        Ok(left.into())
+
+        Ok(list)
     }
 
     /// Consume and cast the first positional argument.

src/eval/scope.rs

@@ -38,20 +38,20 @@ impl<'a> Scopes<'a> {
 
     /// Try to access a variable immutably.
     pub fn get(&self, var: &str) -> StrResult<&Value> {
-        Ok(std::iter::once(&self.top)
+        std::iter::once(&self.top)
             .chain(self.scopes.iter().rev())
             .chain(self.base.map(|base| base.global.scope()))
             .find_map(|scope| scope.get(var))
-            .ok_or(eco_format!("unknown variable: {}", var))?)
+            .ok_or_else(|| eco_format!("unknown variable: {}", var))
     }
 
     /// Try to access a variable immutably in math.
     pub fn get_in_math(&self, var: &str) -> StrResult<&Value> {
-        Ok(std::iter::once(&self.top)
+        std::iter::once(&self.top)
             .chain(self.scopes.iter().rev())
             .chain(self.base.map(|base| base.math.scope()))
             .find_map(|scope| scope.get(var))
-            .ok_or(eco_format!("unknown variable: {}", var))?)
+            .ok_or_else(|| eco_format!("unknown variable: {}", var))
     }
 
     /// Try to access a variable mutably.

src/syntax/parser.rs

@@ -1047,7 +1047,7 @@ fn validate_dict(p: &mut Parser, m: Marker) {
                 };
 
                 if !used.insert(key.clone()) {
-                    first.convert_to_error(eco_format!("duplicate key: {}", key));
+                    first.convert_to_error(eco_format!("duplicate key: {key}"));
                     child.make_erroneous();
                 }
             }

tests/typ/bugs/args-sink.typ

@@ -0,0 +1,5 @@
+// Test bugs with argument sinks.
+
+---
+#let foo(..body) = repr(body.pos())
+#foo(a: "1", b: "2", 1, 2, 3, 4, 5, 6)