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go/analysis: improve error message for string(int) warning

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To an experienced Go user, the previous error message doesn't describe
the error--it merely states a fact. The new error message asks if the
user meant fmt.Sprint(x). If they used the conversion correctly, the
suggested fix to replace string(int) with string(rune(int)) is
understandable and valid. On the other hand, if they used it to print
a digit representation, asking that in the error message further
emphasizes the mistake.

Updates golang/go#39151.

Change-Id: Iab9cdcaf53e9ca134285246fad0546d6f24c3983
Reviewed-on: https://go-review.googlesource.com/c/tools/+/235797
Run-TryBot: Akhil Indurti <aindurti@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
smasher164 2020-05-30 01:52:20 -04:00 committed by Jay Conrod
parent 6aa8f57aac
commit c1934b75d0
3 changed files with 13 additions and 13 deletions
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2
go/analysis/passes/stringintconv/string.go
View File

@ -101,7 +101,7 @@ func run(pass *analysis.Pass) (interface{}, error) {
}
diag := analysis.Diagnostic{
Pos: n.Pos(),
Message: fmt.Sprintf("conversion from %s to %s yields a string of one rune", source, target),
Message: fmt.Sprintf("conversion from %s to %s yields a string of one rune, not a string of digits (did you mean fmt.Sprint(x)?)", source, target),
SuggestedFixes: []analysis.SuggestedFix{
{
Message: "Did you mean to convert a rune to a string?",

12
go/analysis/passes/stringintconv/testdata/src/a/a.go vendored
View File

@ -25,12 +25,12 @@ func StringTest() {
o struct{ x int }
)
const p = 0
_ = string(i) // want `^conversion from int to string yields a string of one rune$`
_ = string(i) // want `^conversion from int to string yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = string(j)
_ = string(k)
_ = string(p) // want `^conversion from untyped int to string yields a string of one rune$`
_ = A(l) // want `^conversion from C \(int\) to A \(string\) yields a string of one rune$`
_ = B(m) // want `^conversion from uintptr to B \(string\) yields a string of one rune$`
_ = string(n[1]) // want `^conversion from int to string yields a string of one rune$`
_ = string(o.x) // want `^conversion from int to string yields a string of one rune$`
_ = string(p) // want `^conversion from untyped int to string yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = A(l) // want `^conversion from C \(int\) to A \(string\) yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = B(m) // want `^conversion from uintptr to B \(string\) yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = string(n[1]) // want `^conversion from int to string yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = string(o.x) // want `^conversion from int to string yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
}

12
go/analysis/passes/stringintconv/testdata/src/a/a.go.golden vendored
View File

@ -25,12 +25,12 @@ func StringTest() {
o struct{ x int }
)
const p = 0
_ = string(rune(i)) // want `^conversion from int to string yields a string of one rune$`
_ = string(rune(i)) // want `^conversion from int to string yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = string(j)
_ = string(k)
_ = string(rune(p)) // want `^conversion from untyped int to string yields a string of one rune$`
_ = A(rune(l)) // want `^conversion from C \(int\) to A \(string\) yields a string of one rune$`
_ = B(rune(m)) // want `^conversion from uintptr to B \(string\) yields a string of one rune$`
_ = string(rune(n[1])) // want `^conversion from int to string yields a string of one rune$`
_ = string(rune(o.x)) // want `^conversion from int to string yields a string of one rune$`
_ = string(rune(p)) // want `^conversion from untyped int to string yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = A(rune(l)) // want `^conversion from C \(int\) to A \(string\) yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = B(rune(m)) // want `^conversion from uintptr to B \(string\) yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = string(rune(n[1])) // want `^conversion from int to string yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
_ = string(rune(o.x)) // want `^conversion from int to string yields a string of one rune, not a string of digits \(did you mean fmt\.Sprint\(x\)\?\)$`
}