Fix parser error pointing to wrong line when last line has no trailing newline (#1041)

pelletier · claude · web-flow · commit 16b1ef5508d9 · 2026-03-23T21:34:12.000-04:00
When parsing a key without '=' at EOF (e.g., "a = 1\nb = 2\nc"), the error highlight was an empty slice, causing subsliceOffset to return 0 and the error to point at line 1 instead of line 3. Pass the consumed key bytes as the highlight instead of the empty remainder. Fixes #1032 https://claude.ai/code/session_01UWv8pyc8P1ktAPfHpveixj Co-authored-by: Claude <noreply@anthropic.com>
diff --git a/errors_test.go b/errors_test.go
@@ -259,6 +259,12 @@ func TestDecodeError_Position(t *testing.T) {
 			expectedRow: 3,
 			minCol:      5,
 		},
+		{
+			name:        "missing equals on last line without trailing newline",
+			doc:         "a = 1\nb = 2\nc",
+			expectedRow: 3,
+			minCol:      1,
+		},
 	}
 
 	for _, e := range examples {
diff --git a/unstable/parser.go b/unstable/parser.go
@@ -345,7 +345,7 @@ func (p *Parser) parseKeyval(b []byte) (reference, []byte, error) {
 	b = p.parseWhitespace(b)
 
 	if len(b) == 0 {
-		return invalidReference, nil, NewParserError(b, "expected = after a key, but the document ends there")
+		return invalidReference, nil, NewParserError(startB[:len(startB)-len(b)], "expected = after a key, but the document ends there")
 	}
 
 	b, err = expect('=', b)

Original file line number	Diff line number	Diff line change
`@@ -345,7 +345,7 @@ func (p *Parser) parseKeyval(b []byte) (reference, []byte, error) {`
`345`	`345`	`b = p.parseWhitespace(b)`
`346`	`346`
`347`	`347`	`if len(b) == 0 {`
`348`		`- return invalidReference, nil, NewParserError(b, "expected = after a key, but the document ends there")`
	`348`	`+ return invalidReference, nil, NewParserError(startB[:len(startB)-len(b)], "expected = after a key, but the document ends there")`
`349`	`349`	`}`
`350`	`350`
`351`	`351`	`b, err = expect('=', b)`