Global: param = twice
Global: VARNAME = VAR.$${param}
Var_Parse: ${VARNAME} (eval)
Global: VAR.${param} = initial-value
Var_Parse: ${${VARNAME}::=assigned-value} (eval-defined)
Var_Parse: ${VARNAME}::=assigned-value} (eval-defined)
Evaluating modifier ${VAR.${param}::...} on value "initial-value"
Modifier part: "assigned-value"
Global: VAR.${param} = assigned-value
Result of ${VAR.${param}::=assigned-value} is ""
Var_Parse: ${${VARNAME}} != "assigned-value" (eval-defined)
Var_Parse: ${VARNAME}} != "assigned-value" (eval-defined)
Global: .MAKEFLAGS =  -r -k -d v -d
Global: .MAKEFLAGS =  -r -k -d v -d 0
Var_Parse: ${CMD_CMD_VAR::=new-value}  || ${CMD_GLOBAL_VAR::=new-value}  || ${CMD_ENV_VAR::=new-value}  || "${CMD_NEW_VAR::=new-value}" (eval-defined)
Evaluating modifier ${CMD_CMD_VAR::...} on value "cmd-value"
Modifier part: "new-value"
Command: CMD_CMD_VAR = new-value
Global: .MAKEOVERRIDES =  FIRST LAST LAST LAST APPENDED RAN RAN RAN IT1 THEN1 IE2 ELSE2 CMD_CMD_VAR CMD_CMD_VAR
Result of ${CMD_CMD_VAR::=new-value} is ""
Var_Parse: ${CMD_GLOBAL_VAR::=new-value}  || ${CMD_ENV_VAR::=new-value}  || "${CMD_NEW_VAR::=new-value}" (eval-defined)
Evaluating modifier ${CMD_GLOBAL_VAR::...} on value "global-value"
Modifier part: "new-value"
Global: CMD_GLOBAL_VAR = new-value
Result of ${CMD_GLOBAL_VAR::=new-value} is ""
Var_Parse: ${CMD_ENV_VAR::=new-value}  || "${CMD_NEW_VAR::=new-value}" (eval-defined)
Evaluating modifier ${CMD_ENV_VAR::...} on value "env-value"
Modifier part: "new-value"
Global: CMD_ENV_VAR = new-value
Result of ${CMD_ENV_VAR::=new-value} is ""
Var_Parse: ${CMD_NEW_VAR::=new-value}" (eval)
Evaluating modifier ${CMD_NEW_VAR::...} on value "" (eval, undefined)
Modifier part: "new-value"
Global: ignoring delete 'CMD_NEW_VAR' as it is not found
Command: CMD_NEW_VAR = new-value
Global: .MAKEOVERRIDES =  FIRST LAST LAST LAST APPENDED RAN RAN RAN IT1 THEN1 IE2 ELSE2 CMD_CMD_VAR CMD_CMD_VAR CMD_NEW_VAR
Result of ${CMD_NEW_VAR::=new-value} is "" (eval, undefined)
Global: .MAKEFLAGS =  -r -k -d v -d 0 -d v -d
Global: .MAKEFLAGS =  -r -k -d v -d 0 -d v -d 0
make: in target "mod-assign-empty": while evaluating "${::=value}" with value "": Bad modifier ":"
mod-assign-empty: value}
make: in target "mod-assign-empty": while evaluating "${:Uvalue::=overwritten}" with value "value": Bad modifier ":"
mod-assign-empty: overwritten}
mod-assign-empty: VAR=overwritten
make: in target "mod-assign-parse": while evaluating variable "ASSIGN" with value "": Unknown modifier ":x"

sysv:y
make: in target "mod-assign-parse": while evaluating variable "ASSIGN" with value "": Unfinished modifier ('}' missing)

ok=word
make: warning: in target "mod-assign-shell-error": while evaluating variable "SH_ERR" with value "previous": Command " echo word; (exit 13) " exited with status 13
err=previous
Command: TARGET_CMD_VAR = cmd-value
Global: TARGET_GLOBAL_VAR = global-value
target: TARGET_TARGET_VAR = target-value
target: TARGET_TARGET_VAR = new-value
Global: TARGET_GLOBAL_VAR = new-value
Global: TARGET_ENV_VAR = new-value
target: TARGET_NEW_VAR = new-value
exit status 2