#!stacks
"sigpanic" && "utf8.DecodeRune:+5"

Issue created by stacks.

Blatant memory corruption:

func DecodeRune(p []byte) (r rune, size int) {
	n := len(p)
	if n < 1 {
		return RuneError, 0
	}
	p0 := p[0] // <--- SEGV

I wonder whether there is any point to creating new issues for cases like this that are clearly just symptoms of the same problem peppering the entire code base at random like a cloud of gunshot. Weirdly though, we got two reports of near-identical crashes within the same 24 hour period, just as we did with #76254.

This stack z3MN_w was reported by telemetry:

• crash/crash
• runtime.gopanic:+69,+0x167
• go/parser.ParseFile.func1:+5,+0x3d7
• runtime.gopanic:+50,+0x131
• runtime.panicmem:=262,+0x197
• runtime.sigpanic:+9,+0x167
• unicode/utf8.DecodeRune:+5,+0x16
• go/scanner.(*Scanner).next:+13,+0xa4
• go/scanner.(*Scanner).Scan:+35,+0xd6
• go/parser.(*parser).next0:+18,+0x184
• go/parser.(*parser).next:+4,+0x64
• go/parser.(*parser).parseOperand:+12,+0x17a
• go/parser.(*parser).parsePrimaryExpr:+6,+0x132
• go/parser.(*parser).parseUnaryExpr:+68,+0x39d
• go/parser.(*parser).parseBinaryExpr:+6,+0x149
• go/parser.(*parser).parseExpr:+5,+0xd4
• go/parser.(*parser).parseValue:+9,+0x118
• go/parser.(*parser).parseElement:+5,+0xe4

golang.org/x/tools/gopls@v0.20.0 go1.24.6 windows/amd64 vscode (1)

Dups: 5l7xNA