remove ast.DefaultScan, dag.DefaultScan, and sem.DefaultScan#7041
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When its extInput parameter is true, compiler/semantic.Analyze prepends an ast.DefaultScan to the AST. Change it to prepend an ast.FileScan for standard input instead. To allow that FileScan to access sio.Readers passed to compiler.CompileWithAST, add a new runtime/exec.Environment.Stdin field, set the field in CompileWithAST if the length of the readers paramter is nonzero, and return a scanner for it in Environment.Open if the field is set when opening standard input.
They're unneeded since ast.DefaultScan is no longer used.
mattnibs
approved these changes
Jun 8, 2026
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They're unneeded since ast.DefaultScan is no longer used.
Depends on #7040.