Generated by SassMeister.com.

input.scss

@for $i from 1 through 6 {
    >.grid-row-#{$i} {
        grid-row-start: $i;      
        -ms-grid-row: $i;
        -ms-grid-row-span: 1;
      
    }
}

output.css

> .grid-row-1 { grid-row-start: 1; -ms-grid-row: 1; -ms-grid-row-span: 1; }

> .grid-row-2 { grid-row-start: 2; -ms-grid-row: 2; -ms-grid-row-span: 1; }

> .grid-row-3 { grid-row-start: 3; -ms-grid-row: 3; -ms-grid-row-span: 1; }

> .grid-row-4 { grid-row-start: 4; -ms-grid-row: 4; -ms-grid-row-span: 1; }

> .grid-row-5 { grid-row-start: 5; -ms-grid-row: 5; -ms-grid-row-span: 1; }

> .grid-row-6 { grid-row-start: 6; -ms-grid-row: 6; -ms-grid-row-span: 1; }

settings.json

{
  "sass": {
    "compiler": "libsass/3.5.5",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "compact"
  },
  "autoprefixer": false
}