Dynamically setting width format no longer working

[matias-eduardo]

After #3566, dynamically setting width in the following way stopped working:

fmt.printf(
    "[% -[1]*v][% -[3]*v][% -[5]*v][% -[7]*v][% -[9]*v]\n",
    6, "First",
    30, "Second",
    10, "Third",
    20, "Fourth",
    20, "Fifth",
)

// Expected output:
// [First ][Second                        ][Third     ][Fourth              ][Fifth               ]

// Current output:
// [%!*(string=First)v][%!*(string=Second)v][%!*(string=Third)v][%!*(string=Fourth)v][%!*(string=Fifth)v]

[Feoramund]

Despite it being given in the old examples, that style of format was never supposed to work. The mechanisms in fmt have since been updated to reflect the documentation in accordance with how C's printf works with regards to argument-specified width.

The correct way to specify width by argument is %*[1]v. For example: fmt.printf("%*[1]s", "Hellope", 16)