diff --git a/grammar.js b/grammar.js
index 2b4b351..fb0d7d8 100644
--- a/grammar.js
+++ b/grammar.js
@@ -174,6 +174,7 @@ module.exports = grammar({
     test_definition: $ => seq(
       'test',
       optional($.string_literal),
+      optional($.parameters),
       $.block_expression
     ),
 
@@ -293,10 +294,10 @@ module.exports = grammar({
     boolean_literal: _ => choice('true', 'false'),
 
     integer_literal: _ => token(choice(
-      /[0-9][0-9_]*L?/,
-      /0[xX][0-9a-fA-F_]+L?/,
-      /0[oO][0-7_]+L?/,
-      /0[bB][01_]+L?/,
+      /[0-9][0-9_]*U?L?/,
+      /0[xX][0-9a-fA-F_]+U?L?/,
+      /0[oO][0-7_]+U?L?/,
+      /0[bB][01_]+U?L?/,
     )),
 
     // integerPart = /[0-9][_0-9]*/,
diff --git a/src/grammar.json b/src/grammar.json
index abb464a..f176867 100644
--- a/src/grammar.json
+++ b/src/grammar.json
@@ -956,6 +956,18 @@
             }
           ]
         },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "parameters"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "SYMBOL",
           "name": "block_expression"
@@ -1547,19 +1559,19 @@
         "members": [
           {
             "type": "PATTERN",
-            "value": "[0-9][0-9_]*L?"
+            "value": "[0-9][0-9_]*U?L?"
           },
           {
             "type": "PATTERN",
-            "value": "0[xX][0-9a-fA-F_]+L?"
+            "value": "0[xX][0-9a-fA-F_]+U?L?"
           },
           {
             "type": "PATTERN",
-            "value": "0[oO][0-7_]+L?"
+            "value": "0[oO][0-7_]+U?L?"
           },
           {
             "type": "PATTERN",
-            "value": "0[bB][01_]+L?"
+            "value": "0[bB][01_]+U?L?"
           }
         ]
       }
diff --git a/src/node-types.json b/src/node-types.json
index 221490a..306939e 100644
--- a/src/node-types.json
+++ b/src/node-types.json
@@ -2189,6 +2189,10 @@
           "type": "block_expression",
           "named": true
         },
+        {
+          "type": "parameters",
+          "named": true
+        },
         {
           "type": "string_literal",
           "named": true
diff --git a/src/parser.c b/src/parser.c
index 86cefe9..7bae45c 100644
Binary files a/src/parser.c and b/src/parser.c differ
diff --git a/test/corpus/literal.txt b/test/corpus/literal.txt
index 4955b10..f7918e5 100644
--- a/test/corpus/literal.txt
+++ b/test/corpus/literal.txt
@@ -279,3 +279,61 @@ fn init {
                           (bytes_literal
                             (string_fragment
                               (unescaped_string_fragment))))))))))))))))
+
+================================================================================
+integer literal
+================================================================================
+fn main {
+  let a = 1
+  let b = 1U
+  let c = 1L
+  let d = 1UL
+}
+--------------------------------------------------------------------------------
+
+(structure
+  (structure_item
+    (function_definition
+      (function_identifier
+        (lowercase_identifier))
+      (block_expression
+        (statement_expression
+          (let_expression
+            (pattern
+              (simple_pattern
+                (lowercase_identifier)))
+            (expression
+              (simple_expression
+                (atomic_expression
+                  (literal
+                    (integer_literal)))))))
+        (statement_expression
+          (let_expression
+            (pattern
+              (simple_pattern
+                (lowercase_identifier)))
+            (expression
+              (simple_expression
+                (atomic_expression
+                  (literal
+                    (integer_literal)))))))
+        (statement_expression
+          (let_expression
+            (pattern
+              (simple_pattern
+                (lowercase_identifier)))
+            (expression
+              (simple_expression
+                (atomic_expression
+                  (literal
+                    (integer_literal)))))))
+        (statement_expression
+          (let_expression
+            (pattern
+              (simple_pattern
+                (lowercase_identifier)))
+            (expression
+              (simple_expression
+                (atomic_expression
+                  (literal
+                    (integer_literal)))))))))))
diff --git a/test/corpus/test.txt b/test/corpus/test.txt
index 8e028ff..2fb05e2 100644
--- a/test/corpus/test.txt
+++ b/test/corpus/test.txt
@@ -46,3 +46,72 @@ test {
                 (atomic_expression
                   (literal
                     (integer_literal)))))))))))
+
+================================================================================
+snapshot
+================================================================================
+test "a" (it : @test.T) {
+  it.writeln("hello")
+  it.snapshot!(filename="test.txt")
+}
+--------------------------------------------------------------------------------
+
+(structure
+  (structure_item
+    (test_definition
+      (string_literal
+        (string_fragment
+          (unescaped_string_fragment)))
+      (parameters
+        (parameter
+          (lowercase_identifier)
+          (type_annotation
+            (colon)
+            (type
+              (apply_type
+                (qualified_type_identifier
+                  (package_identifier)
+                  (dot_identifier
+                    (dot_operator))))))))
+      (block_expression
+        (statement_expression
+          (expression
+            (simple_expression
+              (dot_apply_expression
+                (simple_expression
+                  (qualified_identifier
+                    (lowercase_identifier)))
+                (dot_identifier
+                  (dot_operator))
+                (argument
+                  (expression
+                    (simple_expression
+                      (atomic_expression
+                        (literal
+                          (string_literal
+                            (string_fragment
+                              (unescaped_string_fragment))))))))))))
+        (statement_expression
+          (expression
+            (simple_expression
+              (apply_expression
+                (simple_expression
+                  (access_expression
+                    (simple_expression
+                      (qualified_identifier
+                        (lowercase_identifier)))
+                    (accessor
+                      (dot_identifier
+                        (dot_operator)))))
+                (argument
+                  (argument_label
+                    (simple_expression
+                      (qualified_identifier
+                        (lowercase_identifier))))
+                  (expression
+                    (simple_expression
+                      (atomic_expression
+                        (literal
+                          (string_literal
+                            (string_fragment
+                              (unescaped_string_fragment))))))))))))))))