diff --git a/sjsonnet/src/sjsonnet/Evaluator.scala b/sjsonnet/src/sjsonnet/Evaluator.scala
index 0cdffcfe..d0eeb080 100644
--- a/sjsonnet/src/sjsonnet/Evaluator.scala
+++ b/sjsonnet/src/sjsonnet/Evaluator.scala
@@ -553,6 +553,9 @@ class Evaluator(
           case (l: Val.Num, r: Val.Num) =>
             val ll = l.asSafeLong(pos)
             val rr = r.asSafeLong(pos)
+            if (rr < 0) {
+              Error.fail("shift by negative exponent", pos)
+            }
             if (rr >= 1 && ll >= (1L << (63 - rr)))
               Error.fail("numeric value outside safe integer range for bitwise operation", pos)
             else
@@ -563,7 +566,12 @@ class Evaluator(
       case Expr.BinaryOp.OP_>> =>
         (l, r) match {
           case (l: Val.Num, r: Val.Num) =>
-            Val.Num(pos, (l.asSafeLong(pos) >> r.asSafeLong(pos)).toDouble)
+            val ll = l.asSafeLong(pos)
+            val rr = r.asSafeLong(pos)
+            if (rr < 0) {
+              Error.fail("shift by negative exponent", pos)
+            }
+            Val.Num(pos, (ll >> rr).toDouble)
           case _ => fail()
         }
 
diff --git a/sjsonnet/src/sjsonnet/Parser.scala b/sjsonnet/src/sjsonnet/Parser.scala
index e27915f7..f416de1b 100644
--- a/sjsonnet/src/sjsonnet/Parser.scala
+++ b/sjsonnet/src/sjsonnet/Parser.scala
@@ -97,16 +97,17 @@ class Parser(
   ).map(s => Val.Num(s._1, s._2.toDouble))
 
   def escape[$: P]: P[String] = P(escape0 | escape1)
-  def escape0[$: P]: P[String] = P("\\" ~~ !"u" ~~ AnyChar.!).map {
-    case "\"" => "\""
-    case "'"  => "\'"
-    case "\\" => "\\"
-    case "/"  => "/"
-    case "b"  => "\b"
-    case "f"  => "\f"
-    case "n"  => "\n"
-    case "r"  => "\r"
-    case "t"  => "\t"
+  def escape0[$: P]: P[String] = P("\\" ~~ !"u" ~~ AnyChar.!).flatMapX {
+    case "\"" => Pass("\"")
+    case "'"  => Pass("\'")
+    case "\\" => Pass("\\")
+    case "/"  => Pass("/")
+    case "b"  => Pass("\b")
+    case "f"  => Pass("\f")
+    case "n"  => Pass("\n")
+    case "r"  => Pass("\r")
+    case "t"  => Pass("\t")
+    case s    => Fail.opaque(f"Unknown escape sequence in string literal: $s")
   }
   def escape1[$: P]: P[String] = P("\\u" ~~ CharIn("0-9a-fA-F").repX(min = 4, max = 4).!).map { s =>
     Integer.parseInt(s, 16).toChar.toString
diff --git a/sjsonnet/src/sjsonnet/Std.scala b/sjsonnet/src/sjsonnet/Std.scala
index e3da75d6..f0942507 100644
--- a/sjsonnet/src/sjsonnet/Std.scala
+++ b/sjsonnet/src/sjsonnet/Std.scala
@@ -534,11 +534,19 @@ class Std(
   }
 
   private object DecodeUTF8 extends Val.Builtin1("decodeUTF8", "arr") {
-    def evalRhs(arr: Lazy, ev: EvalScope, pos: Position): Val =
-      new Val.Str(
+    def evalRhs(arr: Lazy, ev: EvalScope, pos: Position): Val = {
+      for ((v, idx) <- arr.force.asArr.iterator.zipWithIndex) {
+        if (!v.isInstanceOf[Val.Num] || !v.asDouble.isWhole || v.asInt < 0 || v.asInt > 255) {
+          throw Error.fail(
+            f"Element $idx of the provided array was not an integer in range [0,255]"
+          )
+        }
+      }
+      Val.Str(
         pos,
-        new String(arr.force.asArr.iterator.map(_.cast[Val.Num].value.toByte).toArray, UTF_8)
+        new String(arr.force.asArr.iterator.map(_.asInt.toByte).toArray, UTF_8)
       )
+    }
   }
 
   private object Substr extends Val.Builtin3("substr", "str", "from", "len") {
@@ -1004,8 +1012,14 @@ class Std(
   }
 
   private object ParseJson extends Val.Builtin1("parseJson", "str") {
-    def evalRhs(str: Lazy, ev: EvalScope, pos: Position): Val =
-      ujson.StringParser.transform(str.force.asString, new ValVisitor(pos))
+    def evalRhs(str: Lazy, ev: EvalScope, pos: Position): Val = {
+      try {
+        ujson.StringParser.transform(str.force.asString, new ValVisitor(pos))
+      } catch {
+        case e: ujson.ParseException =>
+          throw Error.fail("Invalid JSON: " + e.getMessage, pos)(ev)
+      }
+    }
   }
 
   private object ParseYaml extends Val.Builtin1("parseYaml", "str") {
@@ -1276,6 +1290,9 @@ class Std(
         Util.slice(pos, ev, indexable, index, _end, _step)
     },
     builtin("makeArray", "sz", "func") { (pos, ev, sz: Int, func: Val.Func) =>
+      if (sz < 0) {
+        Error.fail(f"std.makeArray requires size >= 0, got $sz")
+      }
       Val.Arr(
         pos, {
           val a = new Array[Lazy](sz)
diff --git a/sjsonnet/src/sjsonnet/Val.scala b/sjsonnet/src/sjsonnet/Val.scala
index e4237290..55fe11e6 100644
--- a/sjsonnet/src/sjsonnet/Val.scala
+++ b/sjsonnet/src/sjsonnet/Val.scala
@@ -109,6 +109,9 @@ object Val {
     override def asString: String = value
   }
   final case class Num(pos: Position, value: Double) extends Literal {
+    if (value.isInfinite) {
+      Error.fail("overflow")
+    }
     def prettyName = "number"
     override def asInt: Int = value.toInt
     override def asLong: Long = value.toLong
diff --git a/sjsonnet/test/resources/test_suite/error.decodeUTF8_float.jsonnet.golden b/sjsonnet/test/resources/test_suite/error.decodeUTF8_float.jsonnet.golden
index c1359b65..523b848a 100644
--- a/sjsonnet/test/resources/test_suite/error.decodeUTF8_float.jsonnet.golden
+++ b/sjsonnet/test/resources/test_suite/error.decodeUTF8_float.jsonnet.golden
@@ -1 +1,3 @@
-"\u0011"
+sjsonnet.Error: Element 0 of the provided array was not an integer in range [0,255]
+    at [std.decodeUTF8].(sjsonnet/test/resources/test_suite/error.decodeUTF8_float.jsonnet:1:15)
+
diff --git a/sjsonnet/test/resources/test_suite/error.decodeUTF8_nan.jsonnet.golden b/sjsonnet/test/resources/test_suite/error.decodeUTF8_nan.jsonnet.golden
index f0c5de75..839199d1 100644
--- a/sjsonnet/test/resources/test_suite/error.decodeUTF8_nan.jsonnet.golden
+++ b/sjsonnet/test/resources/test_suite/error.decodeUTF8_nan.jsonnet.golden
@@ -1,3 +1,3 @@
-sjsonnet.Error: Expected number, found string
+sjsonnet.Error: Element 0 of the provided array was not an integer in range [0,255]
     at [std.decodeUTF8].(sjsonnet/test/resources/test_suite/error.decodeUTF8_nan.jsonnet:1:15)
 
diff --git a/sjsonnet/test/resources/test_suite/error.negative_shfit.jsonnet.golden b/sjsonnet/test/resources/test_suite/error.negative_shfit.jsonnet.golden
index 573541ac..a6c24a59 100644
--- a/sjsonnet/test/resources/test_suite/error.negative_shfit.jsonnet.golden
+++ b/sjsonnet/test/resources/test_suite/error.negative_shfit.jsonnet.golden
@@ -1 +1,3 @@
-0
+sjsonnet.Error: shift by negative exponent
+    at [BinaryOp >>].(error.negative_shfit.jsonnet:1:8)
+
diff --git a/sjsonnet/test/resources/test_suite/error.overflow.jsonnet.golden b/sjsonnet/test/resources/test_suite/error.overflow.jsonnet.golden
index 3c62151d..f4eb3695 100644
--- a/sjsonnet/test/resources/test_suite/error.overflow.jsonnet.golden
+++ b/sjsonnet/test/resources/test_suite/error.overflow.jsonnet.golden
@@ -1 +1,3 @@
-Infinity
+sjsonnet.Error: overflow
+    at [BinaryOp *].(error.overflow2.jsonnet:17:7)
+
diff --git a/sjsonnet/test/resources/test_suite/error.overflow2.jsonnet.golden b/sjsonnet/test/resources/test_suite/error.overflow2.jsonnet.golden
index 3c62151d..f4eb3695 100644
--- a/sjsonnet/test/resources/test_suite/error.overflow2.jsonnet.golden
+++ b/sjsonnet/test/resources/test_suite/error.overflow2.jsonnet.golden
@@ -1 +1,3 @@
-Infinity
+sjsonnet.Error: overflow
+    at [BinaryOp *].(error.overflow2.jsonnet:17:7)
+
diff --git a/sjsonnet/test/resources/test_suite/error.parse.string.invalid_escape.jsonnet.golden b/sjsonnet/test/resources/test_suite/error.parse.string.invalid_escape.jsonnet.golden
index 64e5a9b2..8ab10ae0 100644
--- a/sjsonnet/test/resources/test_suite/error.parse.string.invalid_escape.jsonnet.golden
+++ b/sjsonnet/test/resources/test_suite/error.parse.string.invalid_escape.jsonnet.golden
@@ -1,35 +1,3 @@
-Exception in thread "main" scala.MatchError: o (of class java.lang.String)
-	at sjsonnet.Parser.escape0(Parser.scala:109)
-	at sjsonnet.Parser.escape(Parser.scala:99)
-	at sjsonnet.Parser.rec$2(Parser.scala:115)
-	at sjsonnet.Parser.doubleString(Parser.scala:115)
-	at sjsonnet.Parser.expr2(Parser.scala:349)
-	at sjsonnet.Parser.expr1(Parser.scala:275)
-	at sjsonnet.Parser.expr(Parser.scala:211)
-	at sjsonnet.Parser.document(Parser.scala:567)
-	at sjsonnet.CachedResolver.$anonfun$2(Importer.scala:218)
-	at fastparse.SharedPackageDefs.parseInputRaw(SharedPackageDefs.scala:69)
-	at fastparse.SharedPackageDefs.parseInputRaw$(SharedPackageDefs.scala:6)
-	at fastparse.package$.parseInputRaw(package.scala:5)
-	at fastparse.SharedPackageDefs.parse$$anonfun$1(SharedPackageDefs.scala:35)
-	at fastparse.ParserInputSource$fromParserInput.parseThrough(ParserInput.scala:25)
-	at fastparse.SharedPackageDefs.parse(SharedPackageDefs.scala:42)
-	at fastparse.SharedPackageDefs.parse$(SharedPackageDefs.scala:6)
-	at fastparse.package$.parse(package.scala:5)
-	at sjsonnet.CachedResolver.parse$$anonfun$1(Importer.scala:216)
-	at scala.collection.mutable.HashMap.getOrElseUpdate(HashMap.scala:469)
-	at sjsonnet.DefaultParseCache.getOrElseUpdate(ParseCache.scala:21)
-	at sjsonnet.CachedResolver.parse(Importer.scala:227)
-	at sjsonnet.Interpreter.evaluate(Interpreter.scala:175)
-	at sjsonnet.Interpreter.interpret0(Interpreter.scala:158)
-	at sjsonnet.SjsonnetMain$.renderNormal$$anonfun$1(SjsonnetMain.scala:157)
-	at sjsonnet.SjsonnetMain$.writeToFile(SjsonnetMain.scala:131)
-	at sjsonnet.SjsonnetMain$.renderNormal(SjsonnetMain.scala:155)
-	at sjsonnet.SjsonnetMain$.mainConfigured(SjsonnetMain.scala:332)
-	at sjsonnet.SjsonnetMain$.$anonfun$30$$anonfun$1(SjsonnetMain.scala:85)
-	at scala.util.Either.flatMap(Either.scala:360)
-	at sjsonnet.SjsonnetMain$.$anonfun$30(SjsonnetMain.scala:84)
-	at scala.util.Either.flatMap(Either.scala:360)
-	at sjsonnet.SjsonnetMain$.main0(SjsonnetMain.scala:77)
-	at sjsonnet.SjsonnetMain$.main(SjsonnetMain.scala:44)
-	at sjsonnet.SjsonnetMain.main(SjsonnetMain.scala)
+sjsonnet.ParseError: Expected "\"":17:2, found "\\o\"\n"
+    at .(error.parse.string.invalid_escape.jsonnet:17:2)
+
diff --git a/sjsonnet/test/resources/test_suite/error.parse_json.jsonnet.golden b/sjsonnet/test/resources/test_suite/error.parse_json.jsonnet.golden
index 651a33ff..5bd3a91f 100644
--- a/sjsonnet/test/resources/test_suite/error.parse_json.jsonnet.golden
+++ b/sjsonnet/test/resources/test_suite/error.parse_json.jsonnet.golden
@@ -1,30 +1,3 @@
-sjsonnet.Error: Internal Error
-    at [std.parseJson].(sjsonnet/test/resources/test_suite/error.parse_json.jsonnet:1:14)
-Caused by: ujson.ParseException: expected json value got "b" at index 0
-    at ujson.ParseException$.apply(Exceptions.scala:6)
-    at ujson.CharParser.die(CharParser.scala:98)
-    at ujson.CharParser.parseTopLevel0(CharParser.scala:353)
-    at ujson.CharParser.parseTopLevel(CharParser.scala:323)
-    at ujson.CharParser.parse(CharParser.scala:72)
-    at ujson.StringParser$.transform(StringParser.scala:28)
-    at sjsonnet.Std$ParseJson$.evalRhs(Std.scala:989)
-    at sjsonnet.Evaluator.visitApplyBuiltin1(Evaluator.scala:270)
-    at sjsonnet.Evaluator.visitExpr(Evaluator.scala:40)
-    at sjsonnet.Interpreter.evaluate$$anonfun$2$$anonfun$1(Interpreter.scala:177)
-    at sjsonnet.Interpreter.sjsonnet$Interpreter$$handleException(Interpreter.scala:163)
-    at sjsonnet.Interpreter.evaluate$$anonfun$2(Interpreter.scala:177)
-    at scala.util.Either.flatMap(Either.scala:360)
-    at sjsonnet.Interpreter.evaluate(Interpreter.scala:175)
-    at sjsonnet.Interpreter.interpret0(Interpreter.scala:158)
-    at sjsonnet.SjsonnetMain$.renderNormal$$anonfun$1(SjsonnetMain.scala:157)
-    at sjsonnet.SjsonnetMain$.writeToFile(SjsonnetMain.scala:131)
-    at sjsonnet.SjsonnetMain$.renderNormal(SjsonnetMain.scala:155)
-    at sjsonnet.SjsonnetMain$.mainConfigured(SjsonnetMain.scala:332)
-    at sjsonnet.SjsonnetMain$.$anonfun$30$$anonfun$1(SjsonnetMain.scala:85)
-    at scala.util.Either.flatMap(Either.scala:360)
-    at sjsonnet.SjsonnetMain$.$anonfun$30(SjsonnetMain.scala:84)
-    at scala.util.Either.flatMap(Either.scala:360)
-    at sjsonnet.SjsonnetMain$.main0(SjsonnetMain.scala:77)
-    at sjsonnet.SjsonnetMain$.main(SjsonnetMain.scala:44)
-    at sjsonnet.SjsonnetMain.main(SjsonnetMain.scala)
+sjsonnet.Error: Invalid JSON: expected json value got "b" at index 0
+    at [std.parseJson].(error.parse_json.jsonnet:1:14)
 
diff --git a/sjsonnet/test/resources/test_suite/error.std_makeArray_negative.jsonnet.golden b/sjsonnet/test/resources/test_suite/error.std_makeArray_negative.jsonnet.golden
index 0ad5489a..92100393 100644
--- a/sjsonnet/test/resources/test_suite/error.std_makeArray_negative.jsonnet.golden
+++ b/sjsonnet/test/resources/test_suite/error.std_makeArray_negative.jsonnet.golden
@@ -1,26 +1,3 @@
-sjsonnet.Error: Internal Error
+sjsonnet.Error: std.makeArray requires size >= 0, got -10
     at [std.makeArray].(sjsonnet/test/resources/test_suite/error.std_makeArray_negative.jsonnet:17:14)
-Caused by: java.lang.NegativeArraySizeException: -10
-    at sjsonnet.Std.$init$$$anonfun$13(Std.scala:1262)
-    at sjsonnet.Std.$init$$$anonfun$adapted$7(Std.scala:1259)
-    at sjsonnet.functions.FunctionBuilder$$anon$3.evalRhs(FunctionBuilder.scala:47)
-    at sjsonnet.Evaluator.visitApplyBuiltin2(Evaluator.scala:278)
-    at sjsonnet.Evaluator.visitExpr(Evaluator.scala:41)
-    at sjsonnet.Interpreter.evaluate$$anonfun$2$$anonfun$1(Interpreter.scala:177)
-    at sjsonnet.Interpreter.sjsonnet$Interpreter$$handleException(Interpreter.scala:163)
-    at sjsonnet.Interpreter.evaluate$$anonfun$2(Interpreter.scala:177)
-    at scala.util.Either.flatMap(Either.scala:360)
-    at sjsonnet.Interpreter.evaluate(Interpreter.scala:175)
-    at sjsonnet.Interpreter.interpret0(Interpreter.scala:158)
-    at sjsonnet.SjsonnetMain$.renderNormal$$anonfun$1(SjsonnetMain.scala:157)
-    at sjsonnet.SjsonnetMain$.writeToFile(SjsonnetMain.scala:131)
-    at sjsonnet.SjsonnetMain$.renderNormal(SjsonnetMain.scala:155)
-    at sjsonnet.SjsonnetMain$.mainConfigured(SjsonnetMain.scala:332)
-    at sjsonnet.SjsonnetMain$.$anonfun$30$$anonfun$1(SjsonnetMain.scala:85)
-    at scala.util.Either.flatMap(Either.scala:360)
-    at sjsonnet.SjsonnetMain$.$anonfun$30(SjsonnetMain.scala:84)
-    at scala.util.Either.flatMap(Either.scala:360)
-    at sjsonnet.SjsonnetMain$.main0(SjsonnetMain.scala:77)
-    at sjsonnet.SjsonnetMain$.main(SjsonnetMain.scala:44)
-    at sjsonnet.SjsonnetMain.main(SjsonnetMain.scala)
 
diff --git a/sjsonnet/test/src-js/sjsonnet/ErrorTests.scala b/sjsonnet/test/src-js/sjsonnet/ErrorTests.scala
index 5c42ac38..6bbb84ed 100644
--- a/sjsonnet/test/src-js/sjsonnet/ErrorTests.scala
+++ b/sjsonnet/test/src-js/sjsonnet/ErrorTests.scala
@@ -4,15 +4,6 @@ import utest._
 
 object ErrorTests extends BaseFileTests {
   val skippedTests = Set(
-    "test_suite/error.decodeUTF8_float.jsonnet",
-    "test_suite/error.function_no_default_arg.jsonnet",
-    "test_suite/error.negative_shfit.jsonnet",
-    "test_suite/error.overflow.jsonnet",
-    "test_suite/error.overflow2.jsonnet",
-    "test_suite/error.parse.string.invalid_escape.jsonnet",
-    "test_suite/error.parse_json.jsonnet",
-    "test_suite/error.std_makeArray_negative.jsonnet",
-
     // Stack size issues with the JS runner
     "test_suite/error.array_recursive_manifest.jsonnet",
     "test_suite/error.function_infinite_default.jsonnet",
diff --git a/sjsonnet/test/src-jvm-native/sjsonnet/BaseFileTests.scala b/sjsonnet/test/src-jvm-native/sjsonnet/BaseFileTests.scala
index 89dba1f4..5b602017 100644
--- a/sjsonnet/test/src-jvm-native/sjsonnet/BaseFileTests.scala
+++ b/sjsonnet/test/src-jvm-native/sjsonnet/BaseFileTests.scala
@@ -55,13 +55,18 @@ abstract class BaseFileTests extends TestSuite {
     var res: Either[String, Value] = Right(null)
     try {
       res = eval(fileName)
-      assert(res == Left(expected.stripLineEnd))
+      assert(res.isLeft)
+      val actual = res.left.getOrElse("")
+      assert(actual == expected.stripLineEnd)
     } catch {
       case _: java.lang.StackOverflowError =>
         assert(expected.contains("StackOverflowError"))
       case e: sjsonnet.Error =>
-        assert(expected.stripLineEnd.contains(e.getMessage))
-      case _: Throwable =>
+        assert(expected.stripLineEnd.contains(e.getMessage.stripLineEnd))
+      case e: AssertionError =>
+        throw e
+      case e: Throwable =>
+        println(s"Unexpected error: ${e}")
         assert(false)
     }
   }
diff --git a/sjsonnet/test/src-jvm-native/sjsonnet/ErrorTests.scala b/sjsonnet/test/src-jvm-native/sjsonnet/ErrorTests.scala
index 283f6ca3..c862871b 100644
--- a/sjsonnet/test/src-jvm-native/sjsonnet/ErrorTests.scala
+++ b/sjsonnet/test/src-jvm-native/sjsonnet/ErrorTests.scala
@@ -12,22 +12,11 @@ object ErrorTests extends BaseFileTests {
     "error.recursive_function_nonterm.jsonnet"
   )
 
-  val skippedTests = Set(
-    "error.decodeUTF8_float.jsonnet",
-    "error.function_no_default_arg.jsonnet",
-    "error.negative_shfit.jsonnet",
-    "error.overflow.jsonnet",
-    "error.overflow2.jsonnet",
-    "error.parse.string.invalid_escape.jsonnet",
-    "error.parse_json.jsonnet",
-    "error.std_makeArray_negative.jsonnet"
-  ) ++ (
-    if (isScalaNative) {
-      skippedTestInScalaNative
-    } else {
-      Set()
-    }
-  )
+  val skippedTests = if (isScalaNative) {
+    skippedTestInScalaNative
+  } else {
+    Set.empty[String]
+  }
 
   val tests: Tests = Tests {
     test("error") - {