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cmd/compile: confusing message for syntax error #56022

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ianlancetaylor opened this issue Oct 4, 2022 · 4 comments
Closed

cmd/compile: confusing message for syntax error #56022

ianlancetaylor opened this issue Oct 4, 2022 · 4 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@ianlancetaylor
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Bug mentioned by @apparentlymart in #55863.

With tip, compiling

package main

type Foo struct{}

func (f *Foo) (
	Blah() {}
)

produces the error messages

foo.go:5:15: syntax error: unexpected (, expected name or (
foo.go:6:9: syntax error: unexpected { after top level declaration

The first error makes no sense: it is saying that it found an unexpected left parenthesis when it expected a left parenthesis.

I think the error is in (*parser).funcDeclOrNil: it should not say that it expects a left parenthesis if it already found a receiver.

CC @griesemer

@ianlancetaylor ianlancetaylor added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 4, 2022
@ianlancetaylor ianlancetaylor added this to the Backlog milestone Oct 4, 2022
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Oct 4, 2022
@rittneje
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rittneje commented Oct 4, 2022

Strangely, gofmt yields the correct error message:

prog.go:5:15: expected 'IDENT', found '(' (and 1 more errors)

@ianlancetaylor
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gofmt and the compiler do not use the same parser, so they can have different error messages.

@gopherbot
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Change https://go.dev/cl/437036 mentions this issue: cmd/compile: improve message for syntax error in "funcDeclOrNil"

@gopherbot
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Change https://go.dev/cl/438540 mentions this issue: cmd/compile/internal/syntax: better error message for erroneous method declaration

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compiler/runtime Issues related to the Go compiler and/or runtime. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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