diff --git a/compiler/parse/src/expr.rs b/compiler/parse/src/expr.rs
index dfdd3a41aa..0d9a06b59e 100644
--- a/compiler/parse/src/expr.rs
+++ b/compiler/parse/src/expr.rs
@@ -12,7 +12,8 @@ use crate::parser::{
     self, allocated, and_then_with_indent_level, ascii_char, ascii_string, attempt, backtrackable,
     map, newline_char, not, not_followed_by, optional, sep_by1, sep_by1_e, specialize,
     specialize_ref, then, trailing_sep_by0, unexpected, unexpected_eof, word1, word2, EExpr,
-    EInParens, ELambda, ERecord, Either, If, List, ParseResult, Parser, State, SyntaxError, When,
+    EInParens, ELambda, ERecord, EString, Either, If, List, Number, ParseResult, Parser, State,
+    SyntaxError, When,
 };
 use crate::pattern::loc_closure_param;
 use crate::type_annotation;
@@ -2225,6 +2226,20 @@ fn record_literal<'a>(min_indent: u16) -> impl Parser<'a, Expr<'a>, SyntaxError<
     )
 }
 
-pub fn string_literal<'a>() -> impl Parser<'a, Expr<'a>, SyntaxError<'a>> {
-    map!(crate::string_literal::parse(), Expr::Str)
+fn string_literal<'a>() -> impl Parser<'a, Expr<'a>, SyntaxError<'a>> {
+    specialize(
+        |_, r, c| SyntaxError::Expr(EExpr::Str(EString::EndlessSingle, r, c)),
+        map!(crate::string_literal::parse(), Expr::Str),
+    )
+}
+
+fn string_literal_help<'a>() -> impl Parser<'a, Expr<'a>, EString> {
+    specialize(
+        |_, _, _| EString::EndlessSingle,
+        map!(crate::string_literal::parse(), Expr::Str),
+    )
+}
+
+fn number_literal_help<'a>() -> impl Parser<'a, Expr<'a>, Number> {
+    specialize(|_, _, _| Number::NumberEnd, number_literal())
 }
diff --git a/compiler/parse/src/parser.rs b/compiler/parse/src/parser.rs
index 9e411c49ed..805691b95a 100644
--- a/compiler/parse/src/parser.rs
+++ b/compiler/parse/src/parser.rs
@@ -393,12 +393,35 @@ pub enum EExpr<'a> {
 
     InParens(EInParens<'a>, Row, Col),
     Record(ERecord<'a>, Row, Col),
+    Str(EString, Row, Col),
+    Number(Number, Row, Col),
     List(List<'a>, Row, Col),
 
     IndentStart(Row, Col),
     IndentEnd(Row, Col),
 }
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Number {
+    NumberEnd,
+    NumberDot(i64),
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum EString {
+    EndlessSingle,
+    EndlessMulti,
+    StringEscape(Escape),
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Escape {
+    EscapeUnknown,
+    BadUnicodeFormat(u16),
+    BadUnicodeCode(u16),
+    BadUnicodeLength(u16, i32, i32),
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum ERecord<'a> {
     End(Row, Col),