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go/parser: fails to parse an invalid switch statement #29148

stamblerre opened this issue Dec 7, 2018 · 2 comments


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commented Dec 7, 2018

Repro case:

package main

import "go/ast"

func main() {
	var node ast.Node
	var lit *ast.CompositeLit
	switch n := node.(type) {
	case *ast.CompositeLit:
		lit = n
	case *ast.KeyValueExpr:

In this case, lit. case *ast.KeyValueExpr: gets parsed into an *ast.BadStmt. This is a problem for tools that need to work on broken code.


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commented Dec 7, 2018

@stamblerre stamblerre self-assigned this Dec 7, 2018


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commented Dec 9, 2018

Could be interesting to see what cmd/compile/internal/syntax does here. As far as I've seen, it does a better job with edge cases and errors. Though it doesn't seem to have a BadStmt equivalent right now.

@ALTree ALTree added this to the Unplanned milestone Dec 13, 2018

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