D21357.diff
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	diff --git a/src/lint/renderer/ArcanistConsoleLintRenderer.php b/src/lint/renderer/ArcanistConsoleLintRenderer.php
	--- a/src/lint/renderer/ArcanistConsoleLintRenderer.php
	+++ b/src/lint/renderer/ArcanistConsoleLintRenderer.php
	@@ -122,6 +122,41 @@
	$old_impact = substr_count($original, "\n") + 1;
	$start = $line;

	+ // See PHI1782. If a linter raises a message at a line that does not
	+ // exist, just render a warning message.
	+
	+ // Linters are permitted to raise a warning at the very end of a file.
	+ // For example, if a file is 13 lines long, it is valid to raise a message
	+ // on line 14 as long as the character position is 1 or unspecified and
	+ // there is no "original" text.
	+
	+ $max_old = count($old_lines);
	+
	+ $invalid_position = false;
	+ if ($start > ($max_old + 1)) {
	+ $invalid_position = true;
	+ } else if ($start > $max_old) {
	+ if (strlen($original)) {
	+ $invalid_position = true;
	+ } else if ($char !== null && $char !== 1) {
	+ $invalid_position = true;
	+ }
	+ }
	+
	+ if ($invalid_position) {
	+ $warning = $this->renderLine(
	+ $start,
	+ pht(
	+ '(This message was raised at line %s, but the file only has '.
	+ '%s line(s).)',
	+ new PhutilNumber($start),
	+ new PhutilNumber($max_old)),
	+ false,
	+ '?');
	+
	+ return $warning."\n\n";
	+ }
	+
	if ($message->isPatchable()) {
	$patch_offset = $line_map[$line] + ($char - 1);