Add -pending.txt tests

* `-pending.txt` test files, containing tests labeled with `:skip`
  that highlight known parsing issues in Scala syntax.

* Updated `CONTRIBUTING.md` with a brief explanation of the
  `-pending.txt` test files.

Author: jonshea

CONTRIBUTING.md

@@ -43,6 +43,10 @@ Then adjust as necessary. Note that depending on your change you may also have
 to touch the `/src/scanner.c` file if you need more advanced features like
 look-ahead.
 
+## Pending Tests
+
+In `./test/corpus`, there are several files named `*-pending.txt`. These contain tests labeled with `:skip`, meaning they are not currently run. Each test includes examples of valid Scala syntax that `tree-sitter-scala` is known to fail to parse. If you’d like to contribute to `tree-sitter-scala`, a good place to start is by trying to fix one of these tests.
+
 ## Syntax highlighting
 
 Right now the most common use-case for syntax highlight using tree-sitter is

test/corpus/definitions-pending.txt

@@ -0,0 +1,17 @@
+================================================================================
+Function without parens
+:skip
+================================================================================
+
+// https://github.com/scala/scala3/blob/main/tests/pos/multiLineOps.scala#L15
+send_! "!"
+
+--------------------------------------------------------------------------------
+
+================================================================================
+Types of lambda parameters without parenthesis
+:skip
+================================================================================
+
+// https://github.com/tree-sitter/tree-sitter-scala/issues/361
+xs.map { x: Int => x }

test/corpus/expressions-pending.txt

@@ -0,0 +1,43 @@
+================================================================================
+Trailing coma after for comprehension in lambda parameter of a function
+:skip
+================================================================================
+
+// https://github.com/tree-sitter/tree-sitter-scala/issues/449
+object Foo:
+  def foo(f: Option[Int] => Option[Int]): Option[Int] = f(None)
+
+  foo(o =>
+    for {
+      a <- o
+    } yield a,
+  )
+
+--------------------------------------------------------------------------------
+
+================================================================================
+Lambda expression with semicolon
+:skip
+================================================================================
+
+// https://github.com/tree-sitter/tree-sitter-scala/issues/389
+TypeTreeWithDeferredRefCheck() { () => val tp = qual.tpe; val sym = tp.typeSymbolDirect
+  1
+}
+
+val l1 = { () => val x = 1; 2 }
+
+--------------------------------------------------------------------------------
+
+================================================================================
+infix_expression across multiple lines
+:skip
+================================================================================
+
+// https://github.com/tree-sitter/tree-sitter-scala/issues/141
+def foo: Boolean =
+  x
+  || a.b(c)
+
+--------------------------------------------------------------------------------
+

test/corpus/patterns-pending.txt

@@ -0,0 +1,12 @@
+================================================================================
+Infix types in match type cases
+:skip
+================================================================================
+
+// https://github.com/tree-sitter/tree-sitter-scala/issues/360
+type F[T] = T match {
+  case t *: EmptyTuple => t
+  case t *: rest => t 
+}
+
+--------------------------------------------------------------------------------

test/corpus/types-pending.txt

@@ -0,0 +1,40 @@
+
+================================================================================
+Subclass with multiline params and unnamed after named param
+:skip
+================================================================================
+
+// https://github.com/tree-sitter/tree-sitter-scala/issues/465
+// https://github.com/scala/scala3/blob/main/tests/run/i14164.scala#L5-L9
+class Child extends Base(
+  param =
+    for x <- Seq("a") yield x
+    "param"
+)
+
+--------------------------------------------------------------------------------
+
+================================================================================
+case class nested in an object definition
+:skip
+================================================================================
+
+// https://github.com/tree-sitter/tree-sitter-scala/issues/329
+object Merge:
+
+  case class Location(runIndex: Int, locationInRun: String):
+  end Location
+
+end Merge
+
+--------------------------------------------------------------------------------
+
+================================================================================
+More than two argument lists in `extends`
+:skip
+================================================================================
+
+// https://github.com/tree-sitter/tree-sitter-scala/issues/259
+class A extends B(c)(d)(e)
+
+--------------------------------------------------------------------------------