Syntax interpolation does not work with double quoted strings

[lenaing]

V version: V 0.1.21 a29c80c
OS : Linux 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u1 (2019-09-20) x86_64 GNU/Linux

What did you do ?
I am used to use double quotes as string delimiters. When I try syntax interpolation, it breaks with double quoted string but works with single quoted ones.

fn main() {
    test := "testing"
    println("${test}")
}

What did you expect to see?

$ v run test.v 
testing

What did you see instead?

$ v run test.v
check()
next token = `eof`
addr2line: 'v': No such file
v(+0x3e6bd) [0x5568e79146bd]
addr2line: 'v': No such file
v(+0x23609) [0x5568e78f9609]
addr2line: 'v': No such file
v(+0x20858) [0x5568e78f6858]
addr2line: 'v': No such file
v(+0x4424c) [0x5568e791a24c]
addr2line: 'v': No such file
v(+0x498da) [0x5568e791f8da]
addr2line: 'v': No such file
v(+0x49296) [0x5568e791f296]
addr2line: 'v': No such file
v(+0x48f3c) [0x5568e791ef3c]
addr2line: 'v': No such file
v(+0x4810c) [0x5568e791e10c]
addr2line: 'v': No such file
v(+0x4842b) [0x5568e791e42b]
addr2line: 'v': No such file
v(+0x42692) [0x5568e7918692]
addr2line: 'v': No such file
v(+0x42400) [0x5568e7918400]
addr2line: 'v': No such file
v(+0x4032a) [0x5568e791632a]
addr2line: 'v': No such file
v(+0x3f9df) [0x5568e79159df]
addr2line: 'v': No such file
v(+0x1f067) [0x5568e78f5067]
addr2line: 'v': No such file
v(+0x3b409) [0x5568e7911409]
addr2line: 'v': No such file
v(+0x2dc03) [0x5568e7903c03]
addr2line: 'v': No such file
v(+0x2e1b7) [0x5568e79041b7]
addr2line: 'v': No such file
v(+0x65f28) [0x5568e793bf28]
addr2line: 'v': No such file
v(+0x67689) [0x5568e793d689]
??:0:                                         | /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7fc0b295509b]
addr2line: 'v': No such file
v(+0x249a) [0x5568e78d849a]
test.v:1:0: expected `)` but got `eof`
    1| fn main() {

      ^
    2|     test := "testing"

    3|     println("${test}")

The C temp file seems truncated, (yes, there is really no final brace :)) :

$ tail -10 test.tmp.c 
 }
 ;
 
return  saw != '_' ;
 
 }
 void main__main() {
 
string test= tos3("testing") ;
 

[spytheman]

NB: this works:

fn main() {
    test := "testing"
    println('${test}')
    println("$test")
}

but yours does not ...
So the problem is in
println("${test}")
vs
println('${test}')

Thanks for the bug report.

[Tembocs]

I still face this problem in V version V 0.1.22 06a7954.

[medvednikov]

Fixed.