[racket-users] Concise way to get completions for Racket code?

[nocheroot]

My google-fu is failing me today.  Is there a concise way in Racket to 
request possible completions for some Racket code?  For example, in 
powershell I can ask System.Management.Automation.CommandCompletion for 
possible completions of the powershell code "ConvertTo-Json -"  like this:

$cmd = "ConvertTo-Json -"
$ret = 
[System.Management.Automation.CommandCompletion]::MapStringInputToParsedInput($cmd,
 
$cmd.Length)

$candidates = 
[System.Management.Automation.CommandCompletion]::CompleteInput(
    $ret.Item1,
    $ret.Item2,
    $ret.Item3,
    $null,
    [System.Management.Automation.PowerShell]::Create()
).CompletionMatches

$candidates | ForEach-Object {
    [pscustomobject]@{
        CompletionText = $_.CompletionText
        ResultType = $_.ResultType.ToString()
        ToolTip = $_.ToolTip
    }
}

Outputs (depending on system, powershell and .net version):
CompletionText       ResultType    ToolTip                             
--------------       ----------    -------                             
-InputObject         ParameterName [Object] InputObject                
-Depth               ParameterName [int] Depth                         
-Compress            ParameterName [switch] Compress                   
-Verbose             ParameterName [switch] Verbose                    
-Debug               ParameterName [switch] Debug                      
-ErrorAction         ParameterName [ActionPreference] ErrorAction      
-WarningAction       ParameterName [ActionPreference] WarningAction    
-InformationAction   ParameterName [ActionPreference] InformationAction
-ErrorVariable       ParameterName [string] ErrorVariable              
-WarningVariable     ParameterName [string] WarningVariable            
-InformationVariable ParameterName [string] InformationVariable        
-OutVariable         ParameterName [string] OutVariable                
-OutBuffer           ParameterName [int] OutBuffer                     
-PipelineVariable    ParameterName [string] PipelineVariable           

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