Fix multiline list parsing and expose actionable HTTP failures

lynglib/build.gradle.kts

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 group = "net.sergeych"
-version = "1.5.10"
+version = providers.gradleProperty("lyng.version").getOrElse("1.5.10")
 
 // Removed legacy buildscript classpath declarations; plugins are applied via the plugins DSL below
 

lynglib/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt

@@ -4021,6 +4021,7 @@ class Compiler(
         while (true) {
             val t = cc.next()
             when (t.type) {
+                Token.Type.NEWLINE, Token.Type.SINGLE_LINE_COMMENT, Token.Type.MULTILINE_COMMENT -> continue
                 Token.Type.COMMA -> {
                     // todo: check commas sequences like [,] [,,] before, after or instead of expressions
                 }

lynglib/src/commonTest/kotlin/MultilineListLiteralTest.kt

@@ -0,0 +1,21 @@
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.Script
+import kotlin.test.*
+
+class MultilineListLiteralTest {
+    @Test fun finalNewlineCommentsAndTrailingCommaAreWhitespace() = runTest {
+        val scope = Script.newScope()
+        for (source in listOf(
+            "[\n \"first\",\n \"second\"\n]",
+            "[\n \"first\",\n \"second\",\n]",
+            "[\n // before\n \"first\", /* between */\n \"second\" // after\n]",
+        )) assertEquals("[first,second]", scope.eval(source).toString(scope).value)
+    }
+    @Test fun nestedAndEmptyMultilineListsAndExpressionsRemainValid() = runTest {
+        val scope = Script.newScope()
+        assertEquals("[]", scope.eval("[\n]").toString(scope).value)
+        assertEquals("[[1,2],[3,4]]", scope.eval("[\n [1,2],\n [3,4]\n]").toString(scope).value)
+        assertEquals("[3,7]", scope.eval("[\n 1+2,\n 3+4\n]").toString(scope).value)
+        assertFails { scope.eval("[\n @\n]") }
+    }
+}