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Instruction to reproduce weird bug on append #1170

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Instruction to reproduce weird bug on append #1170

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27 changes: 27 additions & 0 deletions append_bug.sh
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# cd gno.land && go run ./cmd/gnoland start in an other terminal first
#
# Call Append 1
gnokey maketx call -pkgpath "gno.land/r/demo/bug/append" -func "Append" -gas-fee 1000000ugnot -gas-wanted 2000000 -send "" -broadcast -chainid "dev" -args "1" -remote "127.0.0.1:26657" $1
# Call Append 2
gnokey maketx call -pkgpath "gno.land/r/demo/bug/append" -func "Append" -gas-fee 1000000ugnot -gas-wanted 2000000 -send "" -broadcast -chainid "dev" -args "2" -remote "127.0.0.1:26657" $1
# Call Append 3
gnokey maketx call -pkgpath "gno.land/r/demo/bug/append" -func "Append" -gas-fee 1000000ugnot -gas-wanted 2000000 -send "" -broadcast -chainid "dev" -args "3" -remote "127.0.0.1:26657" $1

# Call render
gnokey maketx call -pkgpath "gno.land/r/demo/bug/append" -func "Render" -gas-fee 1000000ugnot -gas-wanted 2000000 -send "" -broadcast -chainid "dev" -args "" -remote "127.0.0.1:26657" $1
# Outputs ("1</br>2</br>3</br>" string) -> OK

# Call Pop
gnokey maketx call -pkgpath "gno.land/r/demo/bug/append" -func "Pop" -gas-fee 1000000ugnot -gas-wanted 2000000 -send "" -broadcast -chainid "dev" -remote "127.0.0.1:26657" $1
# Call render
gnokey maketx call -pkgpath "gno.land/r/demo/bug/append" -func "Render" -gas-fee 1000000ugnot -gas-wanted 2000000 -send "" -broadcast -chainid "dev" -args "" -remote "127.0.0.1:26657" $1
# Outputs ("1</br>2</br>" string) -> WRONG! Pop removes the first item so
# it should be ("2</br>3</br>" string)

# Call Append 42
gnokey maketx call -pkgpath "gno.land/r/demo/bug/append" -func "Append" -gas-fee 1000000ugnot -gas-wanted 2000000 -send "" -broadcast -chainid "dev" -args "42" -remote "127.0.0.1:26657" $1

# Call render
gnokey maketx call -pkgpath "gno.land/r/demo/bug/append" -func "Render" -gas-fee 1000000ugnot -gas-wanted 2000000 -send "" -broadcast -chainid "dev" -args "" -remote "127.0.0.1:26657" $1
# Ouputs ("1</br>2</br>3</br>" string) -> WTF where is 42 ???

25 changes: 25 additions & 0 deletions examples/gno.land/r/demo/bug/append/append.gno
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package append

import (
"gno.land/p/demo/ufmt"
)

type T struct{ i int }

var a []T

func Append(i int) {
a = append(a, T{i: i})
}

func Pop() {
a = append(a[:0], a[1:]...)
}

func Render(_ string) string {
var s string
for i := 0; i < len(a); i++ {
s += ufmt.Sprintf("%d</br>", a[i].i)
}
return s
}
1 change: 1 addition & 0 deletions examples/gno.land/r/demo/bug/append/gno.mod
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module gno.land/r/demo/bug/append
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