h1: make | operator work with anything other than syntactic calls (in which case it just calls the value)

in case you call a function to get a function, parenthesise it

    1 | getFunction ()   -- getFunction 1 ()
    1 | (getFunction ()) -- (getFunction ()) 1

crates/haku/src/compiler.rs

@@ -460,36 +460,36 @@ fn compile_pipe_call<'a>(
     left: NodeId,
     call: NodeId,
 ) -> CompileResult {
-    if src.ast.kind(call) != NodeKind::Call {
+    match src.ast.kind(call) {
-        c.emit(Diagnostic::error(
+        NodeKind::Call => {
-            src.ast.span(call),
+            let mut walk = src.ast.walk(call);
-            "the right side of a pipe `|` must be a function call",
+            let Some(func) = walk.node() else {
-        ));
+                return Ok(());
-        return Ok(());
+            };
+
+            compile_expr(c, src, left)?;
+            let mut argument_count = 1;
+            while let Some(arg) = walk.node() {
+                compile_expr(c, src, arg)?;
+                argument_count += 1;
+            }
+
+            let argument_count = u8::try_from(argument_count).unwrap_or_else(|_| {
+                c.emit(Diagnostic::error(
+                    src.ast.span(call),
+                    "function call has too many arguments",
+                ));
+                0
+            });
+
+            emit_nary_call(c, src, func, argument_count)?;
+        }
+        _ => {
+            compile_expr(c, src, left)?;
+            emit_nary_call(c, src, call, 1)?;
+        }
     }
 
-    let mut walk = src.ast.walk(call);
-    let Some(func) = walk.node() else {
-        return Ok(());
-    };
-
-    compile_expr(c, src, left)?;
-    let mut argument_count = 1;
-    while let Some(arg) = walk.node() {
-        compile_expr(c, src, arg)?;
-        argument_count += 1;
-    }
-
-    let argument_count = u8::try_from(argument_count).unwrap_or_else(|_| {
-        c.emit(Diagnostic::error(
-            src.ast.span(call),
-            "function call has too many arguments",
-        ));
-        0
-    });
-
-    emit_nary_call(c, src, func, argument_count)?;
-
     Ok(())
 }